Implemented internal python shell.
[bpt/emacs.git] / lisp / progmodes / python.el
index 92a1930..98f37fc 100644 (file)
@@ -1,8 +1,10 @@
-;;; python.el -- Python's flying circus support for Emacs
+;;; python.el --- Python's flying circus support for Emacs
 
-;; Copyright (C) 2010 Free Software Foundation, Inc.
+;; Copyright (C) 2010, 2011 Free Software Foundation, Inc.
 
 ;; Author: Fabián E. Gallina <fabian@anue.biz>
+;; URL: https://github.com/fgallina/python.el
+;; Version: 0.23.1
 ;; Maintainer: FSF
 ;; Created: Jul 2010
 ;; Keywords: languages
@@ -34,7 +36,7 @@
 
 ;; Implements Syntax highlighting, Indentation, Movement, Shell
 ;; interaction, Shell completion, Pdb tracking, Symbol completion,
-;; Eldoc.
+;; Skeletons, FFAP, Code Check, Eldoc, imenu.
 
 ;; Syntax highlighting: Fontification of code is provided and supports
 ;; python's triple quoted strings properly.
 ;; causes the current line to be dedented automatically if needed.
 
 ;; Movement: `beginning-of-defun' and `end-of-defun' functions are
-;; properly implemented.  A `beginning-of-innermost-defun' is defined
-;; to navigate nested defuns.
+;; properly implemented.  Also there are specialized
+;; `forward-sentence' and `backward-sentence' replacements
+;; (`python-nav-forward-sentence', `python-nav-backward-sentence'
+;; respectively).  Extra functions `python-nav-sentence-start' and
+;; `python-nav-sentence-end' are included to move to the beginning and
+;; to the end of a setence while taking care of multiline definitions.
 
 ;; Shell interaction: is provided and allows you easily execute any
 ;; block of code of your current buffer in an inferior Python process.
@@ -58,7 +64,7 @@
 ;; IPython) it should be easy to integrate another way to calculate
 ;; completions.  You just need to specify your custom
 ;; `python-shell-completion-setup-code' and
-;; `python-shell-completion-string-code'
+;; `python-shell-completion-string-code'.
 
 ;; Here is a complete example of the settings you would use for
 ;; iPython
 ;; pyreadline from http://ipython.scipy.org/moin/PyReadline/Intro and
 ;; you should be good to go.
 
+;; The shell also contains support for virtualenvs and other special
+;; environment modification thanks to
+;; `python-shell-process-environment' and `python-shell-exec-path'.
+;; These two variables allows you to modify execution paths and
+;; enviroment variables to make easy for you to setup virtualenv rules
+;; or behaviors modifications when running shells.  Here is an example
+;; of how to make shell processes to be run using the /path/to/env/
+;; virtualenv:
+
+;; (setq python-shell-process-environment
+;;       (list
+;;        (format "PATH=%s" (mapconcat
+;;                           'identity
+;;                           (reverse
+;;                            (cons (getenv "PATH")
+;;                                  '("/path/to/env/bin/")))
+;;                           ":"))
+;;        "VIRTUAL_ENV=/path/to/env/"))
+;; (python-shell-exec-path . ("/path/to/env/bin/"))
+
 ;; Pdb tracking: when you execute a block of code that contains some
 ;; call to pdb (or ipdb) it will prompt the block of code and will
 ;; follow the execution of pdb marking the current line with an arrow.
 ;; out of the box.  This feature needs an inferior python shell
 ;; running.
 
-;; Code check: Check the current file for errors using
-;; `python-check-command'
+;; Code check: Check the current file for errors with `python-check'
+;; using the program defined in `python-check-command'.
 
 ;; Eldoc: returns documentation for object at point by using the
 ;; inferior python subprocess to inspect its documentation.  As you
 ;; might guessed you should run `python-shell-send-buffer' from time
 ;; to time to get better results too.
 
+;; imenu: This mode supports imenu.  It builds a plain or tree menu
+;; depending on the value of `python-imenu-make-tree'.  Also you can
+;; customize if menu items should include its type using
+;; `python-imenu-include-defun-type'.
+
 ;; If you used python-mode.el you probably will miss auto-indentation
 ;; when inserting newlines.  To achieve the same behavior you have
 ;; two options:
 
 ;; Ordered by priority:
 
-;; Better decorator support for beginning of defun
-
-;; Review code and cleanup
+;; Give a better interface for virtualenv support in interactive
+;; shells
 
 ;;; Code:
 
 
 (defvar python-mode-map
   (let ((map (make-sparse-keymap)))
+    ;; Movement
+    (substitute-key-definition 'backward-sentence
+                               'python-nav-backward-sentence
+                               map global-map)
+    (substitute-key-definition 'forward-sentence
+                               'python-nav-forward-sentence
+                               map global-map)
     ;; Indent specific
     (define-key map "\177" 'python-indent-dedent-line-backspace)
     (define-key map (kbd "<backtab>") 'python-indent-dedent-line)
        "-"
        ["Start of def/class" beginning-of-defun
         :help "Go to start of outermost definition around point"]
-       ["Start of def/class" python-beginning-of-innermost-defun
-        :help "Go to start of innermost definition around point"]
        ["End of def/class" end-of-defun
         :help "Go to end of definition around point"]
         "-"
                                    (or "def" "class" "if" "elif" "else" "try"
                                        "except" "finally" "for" "while" "with")
                                    symbol-end))
+     `(decorator            . ,(rx line-start (* space) ?@ (any letter ?_)
+                                    (* (any word ?_))))
      `(defun                . ,(rx symbol-start (or "def" "class") symbol-end))
+     `(symbol-name          . ,(rx (any letter ?_) (* (any word ?_))))
      `(open-paren           . ,(rx (or "{" "[" "(")))
      `(close-paren          . ,(rx (or "}" "]" ")")))
      `(simple-operator      . ,(rx (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%)))
                                        "=" "%" "**" "//" "<<" ">>" "<=" "!="
                                        "==" ">=" "is" "not")))
      `(assignment-operator  . ,(rx (or "=" "+=" "-=" "*=" "/=" "//=" "%=" "**="
-                                       ">>=" "<<=" "&=" "^=" "|="))))))
+                                       ">>=" "<<=" "&=" "^=" "|="))))
+    "Additional Python specific sexps for `python-rx'"))
 
 (defmacro python-rx (&rest regexps)
- "Python mode especialized rx macro which supports common python named REGEXPS."
+ "Python mode specialized rx macro which supports common python named REGEXPS."
  (let ((rx-constituents (append python-rx-constituents rx-constituents)))
    (cond ((null regexps)
           (error "No regexp"))
     (,(rx symbol-start "class" (1+ space) (group (1+ (or word ?_))))
      (1 font-lock-type-face))
     ;; Constants
-    (,(rx symbol-start (group "None" symbol-end))
-     (1 font-lock-constant-face))
+    (,(rx symbol-start
+          ;; copyright, license, credits, quit, exit are added by the
+          ;; site module and since they are not intended to be used in
+          ;; programs they are not added here either.
+          (or "None" "True" "False" "Ellipsis" "__debug__" "NotImplemented")
+          symbol-end) . font-lock-constant-face)
     ;; Decorators.
     (,(rx line-start (* (any " \t")) (group "@" (1+ (or word ?_))
                                             (0+ "." (1+ (or word ?_)))))
               "FutureWarning" "GeneratorExit" "IOError" "ImportError"
               "ImportWarning" "IndentationError" "IndexError" "KeyError"
               "KeyboardInterrupt" "LookupError" "MemoryError" "NameError"
-              "NotImplemented" "NotImplementedError" "OSError" "OverflowError"
+              "NotImplementedError" "OSError" "OverflowError"
               "PendingDeprecationWarning" "ReferenceError" "RuntimeError"
               "RuntimeWarning" "StandardError" "StopIteration" "SyntaxError"
               "SyntaxWarning" "SystemError" "SystemExit" "TabError" "TypeError"
               "UserWarning" "ValueError" "Warning" "ZeroDivisionError")
           symbol-end) . font-lock-type-face)
     ;; Builtins
-    (,(rx (or line-start (not (any ". \t"))) (* (any " \t")) symbol-start
-         (group
-           (or "_" "__debug__" "__doc__" "__import__" "__name__" "__package__"
-               "abs" "all" "any" "apply" "basestring" "bin" "bool" "buffer"
-               "bytearray" "bytes" "callable" "chr" "classmethod" "cmp" "coerce"
-               "compile" "complex" "copyright" "credits" "delattr" "dict" "dir"
-               "divmod" "enumerate" "eval" "execfile" "exit" "file" "filter"
-               "float" "format" "frozenset" "getattr" "globals" "hasattr" "hash"
-               "help" "hex" "id" "input" "int" "intern" "isinstance" "issubclass"
-               "iter" "len" "license" "list" "locals" "long" "map" "max" "min"
-               "next" "object" "oct" "open" "ord" "pow" "print" "property" "quit"
-               "range" "raw_input" "reduce" "reload" "repr" "reversed" "round"
-               "set" "setattr" "slice" "sorted" "staticmethod" "str" "sum"
-               "super" "tuple" "type" "unichr" "unicode" "vars" "xrange" "zip"
-               "True" "False" "Ellipsis")) symbol-end)
-     (1 font-lock-builtin-face))
+    (,(rx symbol-start
+          (or "_" "__doc__" "__import__" "__name__" "__package__" "abs" "all"
+              "any" "apply" "basestring" "bin" "bool" "buffer" "bytearray"
+              "bytes" "callable" "chr" "classmethod" "cmp" "coerce" "compile"
+              "complex" "delattr" "dict" "dir" "divmod" "enumerate" "eval"
+              "execfile" "file" "filter" "float" "format" "frozenset"
+              "getattr" "globals" "hasattr" "hash" "help" "hex" "id" "input"
+              "int" "intern" "isinstance" "issubclass" "iter" "len" "list"
+              "locals" "long" "map" "max" "min" "next" "object" "oct" "open"
+              "ord" "pow" "print" "property" "range" "raw_input" "reduce"
+              "reload" "repr" "reversed" "round" "set" "setattr" "slice"
+              "sorted" "staticmethod" "str" "sum" "super" "tuple" "type"
+              "unichr" "unicode" "vars" "xrange" "zip")
+          symbol-end) . font-lock-builtin-face)
     ;; asignations
     ;; support for a = b = c = 5
     (,(lambda (limit)
               (set-match-data nil)))))
      (1 font-lock-variable-name-face nil nil))))
 
-;; Fixme: Is there a better way?
 (defconst python-font-lock-syntactic-keywords
+  ;; Make outer chars of matching triple-quote sequences into generic
+  ;; string delimiters.  Fixme: Is there a better way?
   ;; First avoid a sequence preceded by an odd number of backslashes.
-  `((,(rx (not (any ?\\))
-         ?\\ (* (and ?\\ ?\\))
-         (group (syntax string-quote))
-         (backref 1)
-         (group (backref 1)))
-     (2 ,(string-to-syntax "\"")))     ; dummy
-    (,(rx (group (optional (any "uUrR"))) ; prefix gets syntax property
-         (optional (any "rR"))           ; possible second prefix
-         (group (syntax string-quote))   ; maybe gets property
-         (backref 2)                     ; per first quote
-         (group (backref 2)))            ; maybe gets property
-     (1 (python-quote-syntax 1))
-     (2 (python-quote-syntax 2))
-     (3 (python-quote-syntax 3))))
-  "Make outer chars of triple-quote strings into generic string delimiters.")
-
-(defun python-quote-syntax (n)
+  `((,(concat "\\(?:\\([RUru]\\)[Rr]?\\|^\\|[^\\]\\(?:\\\\.\\)*\\)" ;Prefix.
+            "\\(?:\\('\\)'\\('\\)\\|\\(?2:\"\\)\"\\(?3:\"\\)\\)")
+     (3 (python-quote-syntax)))))
+
+(defun python-quote-syntax ()
   "Put `syntax-table' property correctly on triple quote.
 Used for syntactic keywords.  N is the match number (1, 2 or 3)."
   ;; Given a triple quote, we have to check the context to know
@@ -391,28 +421,25 @@ Used for syntactic keywords.  N is the match number (1, 2 or 3)."
   ;; x '"""' x """ \"""" x
   (save-excursion
     (goto-char (match-beginning 0))
-    (cond
-     ;; Consider property for the last char if in a fenced string.
-     ((= n 3)
-      (let* ((font-lock-syntactic-keywords nil)
-            (syntax (syntax-ppss)))
-       (when (eq t (nth 3 syntax))     ; after unclosed fence
-         (goto-char (nth 8 syntax))    ; fence position
-         (skip-chars-forward "uUrR")   ; skip any prefix
-         ;; Is it a matching sequence?
-         (if (eq (char-after) (char-after (match-beginning 2)))
-             (eval-when-compile (string-to-syntax "|"))))))
-     ;; Consider property for initial char, accounting for prefixes.
-     ((or (and (= n 2)                 ; leading quote (not prefix)
-              (= (match-beginning 1) (match-end 1))) ; prefix is null
-         (and (= n 1)                  ; prefix
-              (/= (match-beginning 1) (match-end 1)))) ; non-empty
-      (let ((font-lock-syntactic-keywords nil))
-       (unless (eq 'string (syntax-ppss-context (syntax-ppss)))
-         (eval-when-compile (string-to-syntax "|")))))
-     ;; Otherwise (we're in a non-matching string) the property is
-     ;; nil, which is OK.
-     )))
+    (let ((syntax (save-match-data (syntax-ppss))))
+      (cond
+       ((eq t (nth 3 syntax))           ; after unclosed fence
+        ;; Consider property for the last char if in a fenced string.
+        (goto-char (nth 8 syntax))     ; fence position
+        (skip-chars-forward "uUrR")    ; skip any prefix
+        ;; Is it a matching sequence?
+        (if (eq (char-after) (char-after (match-beginning 2)))
+            (put-text-property (match-beginning 3) (match-end 3)
+                               'syntax-table (string-to-syntax "|"))))
+       ((match-end 1)
+        ;; Consider property for initial char, accounting for prefixes.
+        (put-text-property (match-beginning 1) (match-end 1)
+                           'syntax-table (string-to-syntax "|")))
+       (t
+        ;; Consider property for initial char, accounting for prefixes.
+        (put-text-property (match-beginning 2) (match-end 2)
+                           'syntax-table (string-to-syntax "|"))))
+      )))
 
 (defvar python-mode-syntax-table
   (let ((table (make-syntax-table)))
@@ -481,7 +508,7 @@ These make `python-indent-calculate-indentation' subtract the value of
                        (not (python-info-ppss-context 'comment))
                        (progn
                          (goto-char (line-end-position))
-                         (forward-comment -1)
+                         (forward-comment -9999)
                          (eq ?: (char-before))))
               (setq found-block t)))
           (if (not found-block)
@@ -493,28 +520,23 @@ These make `python-indent-calculate-indentation' subtract the value of
                         (not (eobp)))
               (forward-line 1))
             (forward-line 1)
-            (forward-comment 1)
+            (forward-comment 9999)
             (let ((indent-offset (current-indentation)))
               (when (> indent-offset 0)
                 (setq python-indent-offset indent-offset))))))))
 
-(defun python-indent-context (&optional stop)
-  "Return information on indentation context.
-Optional argument STOP serves to stop recursive calls.
-
-Returns a cons with the form:
-
-\(STATUS . START)
+(defun python-indent-context ()
+  "Get information on indentation context.
+Context information is returned with a cons with the form:
+    \(STATUS . START)
 
 Where status can be any of the following symbols:
-
  * inside-paren: If point in between (), {} or []
  * inside-string: If point is inside a string
  * after-backslash: Previous line ends in a backslash
  * after-beginning-of-block: Point is after beginning of block
  * after-line: Point is after normal line
  * no-indent: Point is at beginning of buffer or other special case
-
 START is the buffer position where the sexp starts."
   (save-restriction
     (widen)
@@ -545,7 +567,7 @@ START is the buffer position where the sexp starts."
                        (let ((block-regexp (python-rx block-start))
                              (block-start-line-end ":[[:space:]]*$"))
                          (back-to-indentation)
-                         (while (and (forward-comment -1) (not (bobp))))
+                         (while (and (forward-comment -9999) (not (bobp))))
                          (back-to-indentation)
                          (when (or (python-info-continuation-line-p)
                                    (and (not (looking-at block-regexp))
@@ -568,15 +590,8 @@ START is the buffer position where the sexp starts."
          'after-beginning-of-block)
         ;; After normal line
         ((setq start (save-excursion
-                       (while (and (forward-comment -1) (not (bobp))))
-                       (while (and (not (back-to-indentation))
-                                   (not (bobp))
-                                   (if (python-info-ppss-context 'paren)
-                                       (forward-line -1)
-                                     (if (save-excursion
-                                           (forward-line -1)
-                                           (python-info-line-ends-backslash-p))
-                                         (forward-line -1)))))
+                       (while (and (forward-comment -9999) (not (bobp))))
+                       (python-nav-sentence-start)
                        (point-marker)))
          'after-line)
         ;; Do not indent
@@ -623,40 +638,54 @@ START is the buffer position where the sexp starts."
                      (back-to-indentation)
                      (when (looking-at "\\.")
                        (forward-line -1)
-                       (back-to-indentation)
-                       (forward-char (length
-                                      (with-syntax-table python-dotty-syntax-table
-                                        (current-word))))
-                       (re-search-backward "\\." (line-beginning-position) t 1)
-                       (current-column))))
-                  (indentation (cond (block-continuation
-                                      (goto-char block-continuation)
-                                      (re-search-forward
-                                       (python-rx block-start (* space))
-                                       (line-end-position) t)
-                                      (current-column))
-                                     (assignment-continuation
-                                      (goto-char assignment-continuation)
-                                      (re-search-forward
-                                       (python-rx simple-operator)
-                                       (line-end-position) t)
-                                      (forward-char 1)
-                                      (re-search-forward
-                                       (python-rx (* space))
-                                       (line-end-position) t)
-                                      (current-column))
-                                     (dot-continuation
-                                      dot-continuation)
-                                     (t
-                                      (goto-char context-start)
-                                      (current-indentation)))))
+                       (goto-char (line-end-position))
+                       (while (and (re-search-backward "\\." (line-beginning-position) t)
+                                   (or (python-info-ppss-context 'comment)
+                                       (python-info-ppss-context 'string)
+                                       (python-info-ppss-context 'paren))))
+                       (if (and (looking-at "\\.")
+                                (not (or (python-info-ppss-context 'comment)
+                                         (python-info-ppss-context 'string)
+                                         (python-info-ppss-context 'paren))))
+                           (current-column)
+                         (+ (current-indentation) python-indent-offset)))))
+                  (indentation (cond
+                                (dot-continuation
+                                 dot-continuation)
+                                (block-continuation
+                                 (goto-char block-continuation)
+                                 (re-search-forward
+                                  (python-rx block-start (* space))
+                                  (line-end-position) t)
+                                 (current-column))
+                                (assignment-continuation
+                                 (goto-char assignment-continuation)
+                                 (re-search-forward
+                                  (python-rx simple-operator)
+                                  (line-end-position) t)
+                                 (forward-char 1)
+                                 (re-search-forward
+                                  (python-rx (* space))
+                                  (line-end-position) t)
+                                 (current-column))
+                                (t
+                                 (goto-char context-start)
+                                 (if (not
+                                      (save-excursion
+                                        (back-to-indentation)
+                                        (looking-at
+                                         "\\(?:return\\|from\\|import\\)\s+")))
+                                     (current-indentation)
+                                   (+ (current-indentation)
+                                      (length
+                                       (match-string-no-properties 0))))))))
              indentation))
           ('inside-paren
            (or (save-excursion
-                 (forward-comment 1)
-                 (looking-at (regexp-opt '(")" "]" "}")))
-                 (forward-char 1)
-                 (when (not (python-info-ppss-context 'paren))
+                 (skip-syntax-forward "\s" (line-end-position))
+                 (when (and (looking-at (regexp-opt '(")" "]" "}")))
+                            (not (forward-char 1))
+                            (not (python-info-ppss-context 'paren)))
                    (goto-char context-start)
                    (back-to-indentation)
                    (current-column)))
@@ -668,10 +697,10 @@ START is the buffer position where the sexp starts."
                     (narrow-to-region
                      (line-beginning-position)
                      (line-end-position))
-                    (forward-comment 1))
+                    (forward-comment 9999))
                   (if (looking-at "$")
                       (+ (current-indentation) python-indent-offset)
-                    (forward-comment 1)
+                    (forward-comment 9999)
                     (current-column)))
                 (if (progn
                       (back-to-indentation)
@@ -684,15 +713,11 @@ START is the buffer position where the sexp starts."
   (let* ((indentation (python-indent-calculate-indentation))
          (remainder (% indentation python-indent-offset))
          (steps (/ (- indentation remainder) python-indent-offset)))
-    (setq python-indent-levels '())
-    (setq python-indent-levels (cons 0 python-indent-levels))
+    (setq python-indent-levels (list 0))
     (dotimes (step steps)
-      (setq python-indent-levels
-            (cons (* python-indent-offset (1+ step)) python-indent-levels)))
+      (push (* python-indent-offset (1+ step)) python-indent-levels))
     (when (not (eq 0 remainder))
-      (setq python-indent-levels
-            (cons (+ (* python-indent-offset steps) remainder)
-                  python-indent-levels)))
+      (push (+ (* python-indent-offset steps) remainder) python-indent-levels))
     (setq python-indent-levels (nreverse python-indent-levels))
     (setq python-indent-current-level (1- (length python-indent-levels)))))
 
@@ -704,31 +729,29 @@ START is the buffer position where the sexp starts."
 
 (defun python-indent-line (&optional force-toggle)
   "Internal implementation of `python-indent-line-function'.
-
 Uses the offset calculated in
 `python-indent-calculate-indentation' and available levels
-indicated by the variable `python-indent-levels'.
+indicated by the variable `python-indent-levels' to set the
+current indentation.
 
 When the variable `last-command' is equal to
-`indent-for-tab-command' or FORCE-TOGGLE is non-nil:
-
-* Cycles levels indicated in the variable `python-indent-levels'
-  by setting the current level in the variable
-  `python-indent-current-level'.
+`indent-for-tab-command' or FORCE-TOGGLE is non-nil it cycles
+levels indicated in the variable `python-indent-levels' by
+setting the current level in the variable
+`python-indent-current-level'.
 
 When the variable `last-command' is not equal to
-`indent-for-tab-command' and FORCE-TOGGLE is nil:
-
-* calculates possible indentation levels and saves it in the
-  variable `python-indent-levels'.
-
-* sets the variable `python-indent-current-level' correctly so
-  offset is equal to (`nth' `python-indent-current-level'
-  `python-indent-levels')"
+`indent-for-tab-command' and FORCE-TOGGLE is nil it calculates
+possible indentation levels and saves it in the variable
+`python-indent-levels'.  Afterwards it sets the variable
+`python-indent-current-level' correctly so offset is equal
+to (`nth' `python-indent-current-level' `python-indent-levels')"
   (if (or (and (eq this-command 'indent-for-tab-command)
                (eq last-command this-command))
           force-toggle)
-      (python-indent-toggle-levels)
+      (if (not (equal python-indent-levels '(0)))
+          (python-indent-toggle-levels)
+        (python-indent-calculate-levels))
     (python-indent-calculate-levels))
   (beginning-of-line)
   (delete-horizontal-space)
@@ -745,11 +768,11 @@ When the variable `last-command' is not equal to
 
 (defun python-indent-line-function ()
   "`indent-line-function' for Python mode.
-Internally just calls `python-indent-line'."
+See `python-indent-line' for details."
   (python-indent-line))
 
 (defun python-indent-dedent-line ()
-  "Dedent current line."
+  "De-indent current line."
   (interactive "*")
   (when (and (not (or (python-info-ppss-context 'string)
                       (python-info-ppss-context 'comment)))
@@ -761,9 +784,9 @@ Internally just calls `python-indent-line'."
     t))
 
 (defun python-indent-dedent-line-backspace (arg)
-  "Dedent current line.
+  "De-indent current line.
 Argument ARG is passed to `backward-delete-char-untabify' when
-point is not in between the indentation."
+point is  not in between the indentation."
   (interactive "*p")
   (when (not (python-indent-dedent-line))
     (backward-delete-char-untabify arg)))
@@ -795,15 +818,10 @@ Called from a program, START and END specify the region to indent."
 
 (defun python-indent-shift-left (start end &optional count)
   "Shift lines contained in region START END by COUNT columns to the left.
-
-COUNT defaults to `python-indent-offset'.
-
-If region isn't active, the current line is shifted.
-
-The shifted region includes the lines in which START and END lie.
-
-An error is signaled if any lines in the region are indented less
-than COUNT columns."
+COUNT defaults to `python-indent-offset'.  If region isn't
+active, the current line is shifted.  The shifted region includes
+the lines in which START and END lie.  An error is signaled if
+any lines in the region are indented less than COUNT columns."
   (interactive
    (if mark-active
        (list (region-beginning) (region-end) current-prefix-arg)
@@ -826,13 +844,9 @@ than COUNT columns."
 
 (defun python-indent-shift-right (start end &optional count)
   "Shift lines contained in region START END by COUNT columns to the left.
-
-COUNT defaults to `python-indent-offset'.
-
-If region isn't active, the current line is shifted.
-
-The shifted region includes the lines in which START and END
-lie."
+COUNT defaults to `python-indent-offset'.  If region isn't
+active, the current line is shifted.  The shifted region includes
+the lines in which START and END lie."
   (interactive
    (if mark-active
        (list (region-beginning) (region-end) current-prefix-arg)
@@ -844,9 +858,9 @@ lie."
     (indent-rigidly start end count)))
 
 (defun python-indent-electric-colon (arg)
-  "Insert a colon and maybe outdent the line if it is a statement like `else'.
-With numeric ARG, just insert that many colons.  With \\[universal-argument],
-just insert a single colon."
+  "Insert a colon and maybe de-indent the current line.
+With numeric ARG, just insert that many colons.  With
+\\[universal-argument], just insert a single colon."
   (interactive "*P")
   (self-insert-command (if (not (integerp arg)) 1 arg))
   (when (and (not arg)
@@ -866,94 +880,133 @@ just insert a single colon."
 \f
 ;;; Navigation
 
-(defvar python-beginning-of-defun-regexp
-  "^\\(def\\|class\\)[[:space:]]+[[:word:]]+"
-  "Regular expresion matching beginning of outermost class or function.")
-
-(defvar python-beginning-of-innermost-defun-regexp
-  "^[[:space:]]*\\(def\\|class\\)[[:space:]]+[[:word:]]+"
-  "Regular expresion matching beginning of innermost class or function.")
-
-(defun python-beginning-of-defun (&optional innermost)
-  "Move point to the beginning of innermost/outermost def or class.
-If INNERMOST is non-nil then move to the beginning of the
-innermost definition."
-  (let ((starting-point (point-marker))
-        (nonblank-line-indent)
-        (defun-indent)
-        (defun-point)
-        (regexp (if innermost
-                    python-beginning-of-innermost-defun-regexp
-                  python-beginning-of-defun-regexp)))
-    (back-to-indentation)
-    (if (and (not (looking-at "@"))
-             (not (looking-at regexp)))
-        (forward-comment -1)
-      (while (and (not (eobp))
-                  (forward-line 1)
-                  (not (back-to-indentation))
-                  (looking-at "@"))))
-    (when (not (looking-at regexp))
-        (re-search-backward regexp nil t))
-    (setq nonblank-line-indent (+ (current-indentation) python-indent-offset))
-    (setq defun-indent (current-indentation))
-    (setq defun-point (point-marker))
-    (if (> nonblank-line-indent defun-indent)
+(defvar python-nav-beginning-of-defun-regexp
+  (python-rx line-start (* space) defun (+ space) (group symbol-name))
+  "Regular expresion matching beginning of class or function.
+The name of the defun should be grouped so it can be retrieved
+via `match-string'.")
+
+(defun python-nav-beginning-of-defun (&optional nodecorators)
+  "Move point to `beginning-of-defun'.
+When NODECORATORS is non-nil decorators are not included.  This
+is the main part of`python-beginning-of-defun-function'
+implementation.  Return non-nil if point is moved to the
+`beginning-of-defun'."
+  (let ((indent-pos (save-excursion
+                      (back-to-indentation)
+                      (point-marker)))
+        (found)
+        (include-decorators
+         (lambda ()
+           (when (not nodecorators)
+             (when (save-excursion
+                     (forward-line -1)
+                     (looking-at (python-rx decorator)))
+               (while (and (not (bobp))
+                           (forward-line -1)
+                           (looking-at (python-rx decorator))))
+               (when (not (bobp)) (forward-line 1)))))))
+    (if (and (> (point) indent-pos)
+             (save-excursion
+               (goto-char (line-beginning-position))
+               (looking-at python-nav-beginning-of-defun-regexp)))
         (progn
-          (goto-char defun-point)
-          (forward-line -1)
-          (while (and (looking-at "@")
-                      (forward-line -1)
-                      (not (bobp))
-                      (not (back-to-indentation))))
-          (unless (bobp)
-            (forward-line 1))
-          (point-marker))
-      (if innermost
-          (python-beginning-of-defun)
-        (goto-char starting-point)
-        nil))))
-
-(defun python-beginning-of-defun-function ()
-  "Move point to the beginning of outermost def or class.
-Returns nil if point is not in a def or class."
-  (python-beginning-of-defun nil))
-
-(defun python-beginning-of-innermost-defun ()
-  "Move point to the beginning of innermost def or class.
-Returns nil if point is not in a def or class."
-  (interactive)
-  (python-beginning-of-defun t))
+          (goto-char (line-beginning-position))
+          (funcall include-decorators)
+          (setq found t))
+      (goto-char (line-beginning-position))
+      (when (re-search-backward python-nav-beginning-of-defun-regexp nil t)
+        (setq found t))
+      (goto-char (or (python-info-ppss-context 'string) (point)))
+      (funcall include-decorators))
+    found))
+
+(defun python-beginning-of-defun-function (&optional arg nodecorators)
+  "Move point to the beginning of def or class.
+With positive ARG move that number of functions forward.  With
+negative do the same but backwards.  When NODECORATORS is non-nil
+decorators are not included.  Return non-nil if point is moved to the
+`beginning-of-defun'."
+  (when (or (null arg) (= arg 0)) (setq arg 1))
+  (if (> arg 0)
+      (dotimes (i arg (python-nav-beginning-of-defun nodecorators)))
+    (let ((found))
+      (dotimes (i (- arg) found)
+        (python-end-of-defun-function)
+        (forward-comment 9999)
+        (goto-char (line-end-position))
+        (when (not (eobp))
+          (setq found
+                (python-nav-beginning-of-defun nodecorators)))))))
 
 (defun python-end-of-defun-function ()
   "Move point to the end of def or class.
 Returns nil if point is not in a def or class."
-  (let ((starting-point (point-marker))
-        (defun-regexp (python-rx defun))
-        (beg-defun-indent))
-    (back-to-indentation)
-    (if (looking-at "@")
-       (while (and (not (eobp))
-                   (forward-line 1)
-                   (not (back-to-indentation))
-                   (looking-at "@")))
-      (while (and (not (bobp))
-                 (not (progn (back-to-indentation) (current-word)))
-                 (forward-line -1))))
-    (when (or (not (equal (current-indentation) 0))
-              (string-match defun-regexp (current-word)))
-      (setq beg-defun-indent (save-excursion
-                              (or (looking-at defun-regexp)
-                                  (python-beginning-of-innermost-defun))
-                              (current-indentation)))
-      (while (and (forward-line 1)
-                 (not (eobp))
-                 (or (not (current-word))
-                      (> (current-indentation) beg-defun-indent))))
-      (while (and (forward-comment -1)
-                 (not (bobp))))
-      (forward-line 1)
-      (point-marker))))
+  (interactive)
+  (let ((beg-defun-indent)
+        (decorator-regexp "[[:space:]]*@"))
+    (when (looking-at decorator-regexp)
+      (while (and (not (eobp))
+                  (forward-line 1)
+                  (looking-at decorator-regexp))))
+    (when (not (looking-at python-nav-beginning-of-defun-regexp))
+      (python-beginning-of-defun-function))
+    (setq beg-defun-indent (current-indentation))
+    (forward-line 1)
+    (while (and (forward-line 1)
+                (not (eobp))
+                (or (not (current-word))
+                    (> (current-indentation) beg-defun-indent))))
+    (forward-comment 9999)
+    (goto-char (line-beginning-position))))
+
+(defun python-nav-sentence-start ()
+  "Move to start of current sentence."
+  (interactive "^")
+  (while (and (not (back-to-indentation))
+              (not (bobp))
+              (when (or
+                     (save-excursion
+                       (forward-line -1)
+                       (python-info-line-ends-backslash-p))
+                     (python-info-ppss-context 'string)
+                     (python-info-ppss-context 'paren))
+                  (forward-line -1)))))
+
+(defun python-nav-sentence-end ()
+  "Move to end of current sentence."
+  (interactive "^")
+  (while (and (goto-char (line-end-position))
+              (not (eobp))
+              (when (or
+                     (python-info-line-ends-backslash-p)
+                     (python-info-ppss-context 'string)
+                     (python-info-ppss-context 'paren))
+                  (forward-line 1)))))
+
+(defun python-nav-backward-sentence (&optional arg)
+  "Move backward to start of sentence.  With ARG, do it arg times.
+See `python-nav-forward-sentence' for more information."
+  (interactive "^p")
+  (or arg (setq arg 1))
+  (python-nav-forward-sentence (- arg)))
+
+(defun python-nav-forward-sentence (&optional arg)
+  "Move forward to next end of sentence.  With ARG, repeat.
+With negative argument, move backward repeatedly to start of sentence."
+  (interactive "^p")
+  (or arg (setq arg 1))
+  (while (> arg 0)
+    (forward-comment 9999)
+    (python-nav-sentence-end)
+    (forward-line 1)
+    (setq arg (1- arg)))
+  (while (< arg 0)
+    (python-nav-sentence-end)
+    (forward-comment -9999)
+    (python-nav-sentence-start)
+    (forward-line -1)
+    (setq arg (1+ arg))))
 
 \f
 ;;; Shell integration
@@ -967,6 +1020,9 @@ Returns nil if point is not in a def or class."
   :group 'python
   :safe 'stringp)
 
+(defvar python-shell-internal-buffer-name "Python Internal"
+  "Default buffer name for the Internal Python interpreter.")
+
 (defcustom python-shell-interpreter-args "-i"
   "Default arguments for the Python interpreter."
   :type 'string
@@ -974,38 +1030,66 @@ Returns nil if point is not in a def or class."
   :safe 'stringp)
 
 (defcustom python-shell-prompt-regexp ">>> "
-  "Regex matching top\-level input prompt of python shell.
-The regex should not contain a caret (^) at the beginning."
+  "Regular Expression matching top\-level input prompt of python shell.
+It should not contain a caret (^) at the beginning."
   :type 'string
   :group 'python
   :safe 'stringp)
 
 (defcustom python-shell-prompt-block-regexp "[.][.][.] "
-  "Regex matching block input prompt of python shell.
-The regex should not contain a caret (^) at the beginning."
+  "Regular Expression matching block input prompt of python shell.
+It should not contain a caret (^) at the beginning."
   :type 'string
   :group 'python
   :safe 'stringp)
 
 (defcustom python-shell-prompt-output-regexp nil
-  "Regex matching output prompt of python shell.
-The regex should not contain a caret (^) at the beginning."
+  "Regular Expression matching output prompt of python shell.
+It should not contain a caret (^) at the beginning."
   :type 'string
   :group 'python
   :safe 'stringp)
 
 (defcustom python-shell-prompt-pdb-regexp "[(<]*[Ii]?[Pp]db[>)]+ "
-  "Regex matching pdb input prompt of python shell.
-The regex should not contain a caret (^) at the beginning."
+  "Regular Expression matching pdb input prompt of python shell.
+It should not contain a caret (^) at the beginning."
   :type 'string
   :group 'python
   :safe 'stringp)
 
+(defcustom python-shell-send-setup-max-wait 5
+  "Seconds to wait for process output before code setup.
+If output is received before the especified time then control is
+returned in that moment and not after waiting."
+  :type 'number
+  :group 'python
+  :safe 'numberp)
+
+(defcustom python-shell-process-environment nil
+  "List of enviroment variables for Python shell.
+This variable follows the same rules as `process-enviroment'
+since it merges with it before the process creation routines are
+called.  When this variable is nil, the Python shell is run with
+the default `process-enviroment'."
+  :type '(repeat string)
+  :group 'python
+  :safe 'listp)
+
+(defcustom python-shell-exec-path nil
+  "List of path to search for binaries.
+This variable follows the same rules as `exec-path' since it
+merges with it before the process creation routines are called.
+When this variable is nil, the Python shell is run with the
+default `exec-path'."
+  :type '(repeat string)
+  :group 'python
+  :safe 'listp)
+
 (defcustom python-shell-setup-codes '(python-shell-completion-setup-code
                                       python-ffap-setup-code
                                       python-eldoc-setup-code)
   "List of code run by `python-shell-send-setup-codes'.
-Each variable can be either a simple string with the code to
+Each variable can contain either a simple string with the code to
 execute or a cons with the form (CODE . DESCRIPTION), where CODE
 is a string with the code to execute and DESCRIPTION is the
 description of it."
@@ -1030,14 +1114,12 @@ description of it."
 
 (defun python-shell-get-process-name (dedicated)
   "Calculate the appropiate process name for inferior Python process.
-
 If DEDICATED is t and the variable `buffer-file-name' is non-nil
 returns a string with the form
 `python-shell-buffer-name'[variable `buffer-file-name'] else
-returns the value of `python-shell-buffer-name'.
-
-After calculating the process name add the buffer name for the
-process in the `same-window-buffer-names' list"
+returns the value of `python-shell-buffer-name'.  After
+calculating the process name adds the buffer name for the process
+in the `same-window-buffer-names' list."
   (let ((process-name
          (if (and dedicated
                   buffer-file-name)
@@ -1047,8 +1129,22 @@ process in the `same-window-buffer-names' list"
                                             (format "*%s*" process-name)))
     process-name))
 
+(defun python-shell-internal-get-process-name ()
+  "Calculate the appropiate process name for Internal Python process.
+The name is calculated from `python-shell-global-buffer-name' and
+a hash of all relevant global shell settings in order to ensure
+uniqueness for different types of configurations."
+  (format "%s [%s]"
+          python-shell-internal-buffer-name
+          (md5
+           (concat
+            (python-shell-parse-command)
+            (mapconcat #'symbol-value python-shell-setup-codes "")
+            (mapconcat #'indentity python-shell-process-environment "")
+            (mapconcat #'indentity python-shell-exec-path "")))))
+
 (defun python-shell-parse-command ()
-  "Calculates the string used to execute the inferior Python process."
+  "Calculate the string used to execute the inferior Python process."
   (format "%s %s" python-shell-interpreter python-shell-interpreter-args))
 
 (defun python-comint-output-filter-function (output)
@@ -1062,10 +1158,24 @@ OUTPUT is a string with the contents of the buffer."
 
 (define-derived-mode inferior-python-mode comint-mode "Inferior Python"
   "Major mode for Python inferior process.
-Adds `python-shell-completion-complete-at-point' to the
-`comint-dynamic-complete-functions' list.  Also binds <tab> to
-`python-shell-complete-or-indent' in the
-`inferior-python-mode-map'."
+Runs a Python interpreter as a subprocess of Emacs, with Python
+I/O through an Emacs buffer.  Variables
+`python-shell-interpreter' and `python-shell-interpreter-args'
+controls which Python interpreter is run.  Variables
+`python-shell-prompt-regexp',
+`python-shell-prompt-output-regexp',
+`python-shell-prompt-block-regexp',
+`python-shell-completion-setup-code',
+`python-shell-completion-string-code', `python-eldoc-setup-code',
+`python-eldoc-string-code', `python-ffap-setup-code' and
+`python-ffap-string-code' can customize this mode for different
+Python interpreters.
+
+You can also add additional setup code to be run at
+initialization of the interpreter via `python-shell-setup-codes'
+variable.
+
+\(Type \\[describe-mode] in the process buffer for a list of commands.)"
   (set-syntax-table python-mode-syntax-table)
   (setq mode-line-process '(":%s"))
   (setq comint-prompt-regexp (format "^\\(?:%s\\|%s\\|%s\\)"
@@ -1091,26 +1201,17 @@ Adds `python-shell-completion-complete-at-point' to the
 
 (defun run-python (dedicated cmd)
   "Run an inferior Python process.
-
-Input and output via buffer *\\[python-shell-buffer-name]*.
-
-If there is a process already running in
-*\\[python-shell-buffer-name]*, switch to that buffer.
-
-With argument, allows you to:
-
- * Define DEDICATED so a dedicated process for the current buffer
-   is open.
-
- * Define CMD so you can edit the command used to call the
-interpreter (default is value of `python-shell-interpreter' and
-arguments defined in `python-shell-interpreter-args').
-
-Runs the hook `inferior-python-mode-hook' (after the
-`comint-mode-hook' is run).
-
-\(Type \\[describe-mode] in the process buffer for a list of
-commands.)"
+Input and output via buffer named after
+`python-shell-buffer-name'.  If there is a process already
+running in that buffer, just switch to it.
+With argument, allows you to define DEDICATED, so a dedicated
+process for the current buffer is open, and define CMD so you can
+edit the command used to call the interpreter (default is value
+of `python-shell-interpreter' and arguments defined in
+`python-shell-interpreter-args').  Runs the hook
+`inferior-python-mode-hook' (after the `comint-mode-hook' is
+run).
+\(Type \\[describe-mode] in the process buffer for a list of commands.)"
   (interactive
    (if current-prefix-arg
        (list
@@ -1118,7 +1219,17 @@ commands.)"
         (read-string "Run Python: " (python-shell-parse-command)))
      (list nil (python-shell-parse-command))))
   (let* ((proc-name (python-shell-get-process-name dedicated))
-         (proc-buffer-name (format "*%s*" proc-name)))
+         (proc-buffer-name (format "*%s*" proc-name))
+         (process-environment
+          (if python-shell-process-environment
+              (python-util-merge 'list python-shell-process-environment
+                                 process-environment 'string=)
+            process-environment))
+         (exec-path
+          (if python-shell-exec-path
+              (python-util-merge 'list python-shell-exec-path
+                                 exec-path 'string=)
+            exec-path)))
     (when (not (comint-check-proc proc-buffer-name))
       (let ((cmdlist (split-string-and-unquote cmd)))
         (set-buffer
@@ -1128,6 +1239,42 @@ commands.)"
     (pop-to-buffer proc-buffer-name))
   dedicated)
 
+(defun run-python-internal ()
+  "Run an inferior Internal Python process.
+Input and output via buffer named after
+`python-shell-internal-buffer-name' and what
+`python-shell-internal-get-process-name' returns.  This new kind
+of shell is intended to be used for generic communication related
+to defined configurations.  The main difference with global or
+dedicated shells is that these ones are attached to a
+configuration, not a buffer.  This means that can be used for
+example to retrieve the sys.path and other stuff, without messing
+with user shells.  Runs the hook
+`inferior-python-mode-hook' (after the `comint-mode-hook' is
+run).  \(Type \\[describe-mode] in the process buffer for a list
+of commands.)"
+  (interactive)
+  (save-excursion
+    (let* ((cmd (python-shell-parse-command))
+           (proc-name (python-shell-internal-get-process-name))
+           (proc-buffer-name (format "*%s*" proc-name))
+           (process-environment
+            (if python-shell-process-environment
+                (python-util-merge 'list python-shell-process-environment
+                                   process-environment 'string=)
+              process-environment))
+           (exec-path
+            (if python-shell-exec-path
+                (python-util-merge 'list python-shell-exec-path
+                                   exec-path 'string=)
+              exec-path)))
+      (when (not (comint-check-proc proc-buffer-name))
+        (let ((cmdlist (split-string-and-unquote cmd)))
+          (set-buffer
+           (apply 'make-comint proc-name (car cmdlist) nil
+                  (cdr cmdlist)))
+          (inferior-python-mode))))))
+
 (defun python-shell-get-process ()
   "Get inferior Python process for current buffer and return it."
   (let* ((dedicated-proc-name (python-shell-get-process-name t))
@@ -1160,6 +1307,13 @@ commands.)"
                             dedicated-proc-buffer-name
                           global-proc-buffer-name))))
 
+(defun python-shell-internal-get-or-create-process ()
+  "Get or create an inferior Internal Python process."
+  (let* ((proc-name (python-shell-internal-get-process-name))
+         (proc-buffer-name (format "*%s*" proc-name)))
+    (run-python-internal)
+    (get-buffer-process proc-buffer-name)))
+
 (defun python-shell-send-string (string &optional process msg)
   "Send STRING to inferior Python PROCESS.
 When MSG is non-nil messages the first line of STRING."
@@ -1182,8 +1336,8 @@ When MSG is non-nil messages the first line of STRING."
 
 (defun python-shell-send-string-no-output (string &optional process msg)
   "Send STRING to PROCESS and inhibit output.
-When MSG is non-nil messages the first line of STRING.
-Return the output."
+When MSG is non-nil messages the first line of STRING.  Return
+the output."
   (let* ((output-buffer)
          (process (or process (python-shell-get-or-create-process)))
          (comint-preoutput-filter-functions
@@ -1201,7 +1355,7 @@ Return the output."
             (with-temp-buffer
               (insert output-buffer)
               (goto-char (point-min))
-              (forward-comment 1)
+              (forward-comment 9999)
               (buffer-substring-no-properties
                (or
                 (and (looking-at python-shell-prompt-output-regexp)
@@ -1213,6 +1367,21 @@ Return the output."
      (lambda (string) string)
      (butlast (split-string output-buffer "\n")) "\n")))
 
+(defun python-shell-internal-send-string (string)
+  "Send STRING to the Internal Python interpreter.
+Returns the output.  See `python-shell-send-string-no-output'."
+  (python-shell-send-string-no-output
+   ;; Makes this function compatible with the old
+   ;; python-send-receive. (At least for CEDET).
+   (replace-regexp-in-string "_emacs_out +" "" string)
+   (python-shell-internal-get-or-create-process) nil))
+
+(define-obsolete-function-alias
+  'python-send-receive 'python-shell-internal-send-string "23.3"
+  "Send STRING to inferior Python (if any) and return result.
+The result is what follows `_emacs_out' in the output.
+This is a no-op if `python-check-comint-prompt' returns nil.")
+
 (defun python-shell-send-region (start end)
   "Send the region delimited by START and END to inferior Python process."
   (interactive "r")
@@ -1227,18 +1396,17 @@ Return the output."
     (python-shell-send-region (point-min) (point-max))))
 
 (defun python-shell-send-defun (arg)
-  "Send the (inner|outer)most def or class to inferior Python process.
+  "Send the current defun to inferior Python process.
 When argument ARG is non-nil sends the innermost defun."
   (interactive "P")
   (save-excursion
-    (python-shell-send-region (progn
-                            (or (if arg
-                                    (python-beginning-of-innermost-defun)
-                                  (python-beginning-of-defun-function))
-                                (progn (beginning-of-line) (point-marker))))
-                          (progn
-                            (or (python-end-of-defun-function)
-                                (progn (end-of-line) (point-marker)))))))
+    (python-shell-send-region
+     (progn
+       (or (python-beginning-of-defun-function)
+           (progn (beginning-of-line) (point-marker))))
+     (progn
+       (or (python-end-of-defun-function)
+           (progn (end-of-line) (point-marker)))))))
 
 (defun python-shell-send-file (file-name &optional process temp-file-name)
   "Send FILE-NAME to inferior Python PROCESS.
@@ -1274,7 +1442,7 @@ This function takes the list of setup code to send from the
 `python-shell-setup-codes' list."
   (let ((msg "Sent %s")
         (process (get-buffer-process (current-buffer))))
-    (accept-process-output process 1)
+    (accept-process-output process python-shell-send-setup-max-wait)
     (dolist (code python-shell-setup-codes)
       (when code
         (when (consp code)
@@ -1360,8 +1528,8 @@ else:
 
 (defun python-shell-completion-complete-or-indent ()
   "Complete or indent depending on the context.
-If content before pointer is all whitespace indent.  If not try to
-complete."
+If content before pointer is all whitespace indent.  If not try
+to complete."
   (interactive)
   (if (string-match "^[[:space:]]*$"
                     (buffer-substring (comint-line-beginning-position)
@@ -1374,12 +1542,11 @@ complete."
 
 (defvar python-pdbtrack-stacktrace-info-regexp
   "> %s(\\([0-9]+\\))\\([?a-zA-Z0-9_<>]+\\)()"
-  "Regexp matching stacktrace information.
-It is used to extract the current line and module beign
-inspected.
-The regexp should not start with a caret (^) and can contain a
-string placeholder (\%s) which is replaced with the filename
-beign inspected (so other files in the debugging process are not
+  "Regular Expression matching stacktrace information.
+Used to extract the current line and module beign inspected.  The
+regexp should not start with a caret (^) and can contain a string
+placeholder (\%s) which is replaced with the filename beign
+inspected (so other files in the debugging process are not
 opened)")
 
 (defvar python-pdbtrack-tracking-buffers '()
@@ -1478,6 +1645,38 @@ inferior python process is updated properly."
 \f
 ;;; Fill paragraph
 
+(defcustom python-fill-comment-function 'python-fill-comment
+  "Function to fill comments.
+This is the function used by `python-fill-paragraph-function' to
+fill comments."
+  :type 'symbol
+  :group 'python
+  :safe 'symbolp)
+
+(defcustom python-fill-string-function 'python-fill-string
+  "Function to fill strings.
+This is the function used by `python-fill-paragraph-function' to
+fill strings."
+  :type 'symbol
+  :group 'python
+  :safe 'symbolp)
+
+(defcustom python-fill-decorator-function 'python-fill-decorator
+  "Function to fill decorators.
+This is the function used by `python-fill-paragraph-function' to
+fill decorators."
+  :type 'symbol
+  :group 'python
+  :safe 'symbolp)
+
+(defcustom python-fill-paren-function 'python-fill-paren
+  "Function to fill parens.
+This is the function used by `python-fill-paragraph-function' to
+fill parens."
+  :type 'symbol
+  :group 'python
+  :safe 'symbolp)
+
 (defun python-fill-paragraph-function (&optional justify)
   "`fill-paragraph-function' handling multi-line strings and possibly comments.
 If any of the current line is in or at the end of a multi-line string,
@@ -1489,82 +1688,103 @@ Optional argument JUSTIFY defines if the paragraph should be justified."
     (back-to-indentation)
     (cond
      ;; Comments
-     ((fill-comment-paragraph justify))
-     ;; Docstrings
+     ((funcall python-fill-comment-function justify))
+     ;; Strings/Docstrings
      ((save-excursion (skip-chars-forward "\"'uUrR")
                       (python-info-ppss-context 'string))
-      (let ((marker (point-marker))
-            (string-start-marker
-             (progn
-               (skip-chars-forward "\"'uUrR")
-               (goto-char (python-info-ppss-context 'string))
-               (skip-chars-forward "\"'uUrR")
-               (point-marker)))
-            (reg-start (line-beginning-position))
-            (string-end-marker
-             (progn
-               (while (python-info-ppss-context 'string)
-                 (goto-char (1+ (point-marker))))
-               (skip-chars-backward "\"'")
-               (point-marker)))
-            (reg-end (line-end-position))
-            (fill-paragraph-function))
-        (save-restriction
-          (narrow-to-region reg-start reg-end)
-          (save-excursion
-            (goto-char string-start-marker)
-            (delete-region (point-marker) (progn
-                                            (skip-syntax-forward "> ")
-                                            (point-marker)))
-            (goto-char string-end-marker)
-            (delete-region (point-marker) (progn
-                                            (skip-syntax-backward "> ")
-                                            (point-marker)))
-            (save-excursion
-              (goto-char marker)
-              (fill-paragraph justify))
-            ;; If there is a newline in the docstring lets put triple
-            ;; quote in it's own line to follow pep 8
-            (when (save-excursion
-                    (re-search-backward "\n" string-start-marker t))
-              (newline)
-              (newline-and-indent))
-            (fill-paragraph justify)))) t)
+      (funcall python-fill-string-function justify))
      ;; Decorators
      ((equal (char-after (save-excursion
                            (back-to-indentation)
-                           (point-marker))) ?@) t)
+                           (point-marker))) ?@)
+      (funcall python-fill-decorator-function justify))
      ;; Parens
      ((or (python-info-ppss-context 'paren)
           (looking-at (python-rx open-paren))
           (save-excursion
             (skip-syntax-forward "^(" (line-end-position))
             (looking-at (python-rx open-paren))))
-      (save-restriction
-        (narrow-to-region (progn
-                            (while (python-info-ppss-context 'paren)
-                              (goto-char (1- (point-marker))))
-                            (point-marker)
-                            (line-beginning-position))
-                          (progn
-                            (when (not (python-info-ppss-context 'paren))
-                              (end-of-line)
-                              (when (not (python-info-ppss-context 'paren))
-                                (skip-syntax-backward "^)")))
-                            (while (python-info-ppss-context 'paren)
-                              (goto-char (1+ (point-marker))))
-                            (point-marker)))
-        (let ((paragraph-start "\f\\|[ \t]*$")
-              (paragraph-separate ",")
-              (fill-paragraph-function))
-          (goto-char (point-min))
-          (fill-paragraph justify))
-        (while (not (eobp))
-          (forward-line 1)
-          (python-indent-line)
-          (goto-char (line-end-position)))) t)
+      (funcall python-fill-paren-function justify))
      (t t))))
 
+(defun python-fill-comment (&optional justify)
+  "Comment fill function for `python-fill-paragraph-function'.
+JUSTIFY should be used (if applicable) as in `fill-paragraph'."
+  (fill-comment-paragraph justify))
+
+(defun python-fill-string (&optional justify)
+  "String fill function for `python-fill-paragraph-function'.
+JUSTIFY should be used (if applicable) as in `fill-paragraph'."
+  (let ((marker (point-marker))
+        (string-start-marker
+         (progn
+           (skip-chars-forward "\"'uUrR")
+           (goto-char (python-info-ppss-context 'string))
+           (skip-chars-forward "\"'uUrR")
+           (point-marker)))
+        (reg-start (line-beginning-position))
+        (string-end-marker
+         (progn
+           (while (python-info-ppss-context 'string)
+             (goto-char (1+ (point-marker))))
+           (skip-chars-backward "\"'")
+           (point-marker)))
+        (reg-end (line-end-position))
+        (fill-paragraph-function))
+    (save-restriction
+      (narrow-to-region reg-start reg-end)
+      (save-excursion
+        (goto-char string-start-marker)
+        (delete-region (point-marker) (progn
+                                        (skip-syntax-forward "> ")
+                                        (point-marker)))
+        (goto-char string-end-marker)
+        (delete-region (point-marker) (progn
+                                        (skip-syntax-backward "> ")
+                                        (point-marker)))
+        (save-excursion
+          (goto-char marker)
+          (fill-paragraph justify))
+        ;; If there is a newline in the docstring lets put triple
+        ;; quote in it's own line to follow pep 8
+        (when (save-excursion
+                (re-search-backward "\n" string-start-marker t))
+          (newline)
+          (newline-and-indent))
+        (fill-paragraph justify)))) t)
+
+(defun python-fill-decorator (&optional justify)
+  "Decorator fill function for `python-fill-paragraph-function'.
+JUSTIFY should be used (if applicable) as in `fill-paragraph'."
+  t)
+
+(defun python-fill-paren (&optional justify)
+  "Paren fill function for `python-fill-paragraph-function'.
+JUSTIFY should be used (if applicable) as in `fill-paragraph'."
+  (save-restriction
+    (narrow-to-region (progn
+                        (while (python-info-ppss-context 'paren)
+                          (goto-char (1- (point-marker))))
+                        (point-marker)
+                        (line-beginning-position))
+                      (progn
+                        (when (not (python-info-ppss-context 'paren))
+                          (end-of-line)
+                          (when (not (python-info-ppss-context 'paren))
+                            (skip-syntax-backward "^)")))
+                        (while (python-info-ppss-context 'paren)
+                          (goto-char (1+ (point-marker))))
+                        (point-marker)))
+    (let ((paragraph-start "\f\\|[ \t]*$")
+          (paragraph-separate ",")
+          (fill-paragraph-function))
+      (goto-char (point-min))
+      (fill-paragraph justify))
+    (while (not (eobp))
+      (forward-line 1)
+      (python-indent-line)
+      (goto-char (line-end-position)))) t)
+
 \f
 ;;; Skeletons
 
@@ -1768,10 +1988,28 @@ Runs COMMAND, a shell command, as if by `compile'.  See
 (defvar python-eldoc-setup-code
   "def __PYDOC_get_help(obj):
     try:
-        import pydoc
+        import inspect
         if hasattr(obj, 'startswith'):
             obj = eval(obj, globals())
-        doc = pydoc.getdoc(obj)
+        doc = inspect.getdoc(obj)
+        if not doc and callable(obj):
+            target = None
+            if inspect.isclass(obj) and hasattr(obj, '__init__'):
+                target = obj.__init__
+                objtype = 'class'
+            else:
+                target = obj
+                objtype = 'def'
+            if target:
+                args = inspect.formatargspec(
+                    *inspect.getargspec(target)
+                )
+                name = obj.__name__
+                doc = '{objtype} {name}{args}'.format(
+                    objtype=objtype, name=name, args=args
+                )
+        else:
+            doc = doc.splitlines()[0]
     except:
         doc = ''
     try:
@@ -1844,42 +2082,161 @@ Interactively, prompt for symbol."
     (let ((process (python-shell-get-process)))
       (if (not process)
           (message "Eldoc needs an inferior Python process running.")
-        (let ((temp-buffer-show-hook
-               (lambda ()
-                 (toggle-read-only 1)
-                 (setq view-return-to-alist
-                       (list (cons (selected-window) help-return-method))))))
-          (with-output-to-temp-buffer (help-buffer)
-            (with-current-buffer standard-output
-              (insert
-               (python-eldoc--get-doc-at-point symbol process))
-              (help-print-return-message)))))))
+        (message (python-eldoc--get-doc-at-point symbol process)))))
+
+\f
+;;; Imenu
+
+(defcustom python-imenu-include-defun-type t
+  "Non-nil make imenu items to include its type."
+  :type 'boolean
+  :group 'python
+  :safe 'booleanp)
+
+(defcustom python-imenu-make-tree t
+  "Non-nil make imenu to build a tree menu.
+Set to nil for speed."
+  :type 'boolean
+  :group 'python
+  :safe 'booleanp)
+
+(defcustom python-imenu-subtree-root-label "<Jump to %s>"
+  "Label displayed to navigate to root from a subtree.
+It can contain a \"%s\" which will be replaced with the root name."
+  :type 'string
+  :group 'python
+  :safe 'stringp)
+
+(defvar python-imenu-index-alist nil
+  "Calculated index tree for imenu.")
+
+(defun python-imenu-tree-assoc (keylist tree)
+  "Using KEYLIST traverse TREE."
+  (if keylist
+      (python-imenu-tree-assoc (cdr keylist)
+                               (ignore-errors (assoc (car keylist) tree)))
+    tree))
+
+(defun python-imenu-make-element-tree (element-list full-element plain-index)
+  "Make a tree from plain alist of module names.
+ELEMENT-LIST is the defun name splitted by \".\" and FULL-ELEMENT
+is the same thing, the difference is that FULL-ELEMENT remains
+untouched in all recursive calls.
+Argument PLAIN-INDEX is the calculated plain index used to build the tree."
+  (when (not (python-imenu-tree-assoc full-element python-imenu-index-alist))
+    (when element-list
+      (let* ((subelement-point (cdr (assoc
+                                     (mapconcat #'identity full-element ".")
+                                     plain-index)))
+             (subelement-name (car element-list))
+             (subelement-position (python-util-position
+                                   subelement-name full-element))
+             (subelement-path (when subelement-position
+                                (butlast
+                                 full-element
+                                 (- (length full-element)
+                                    subelement-position)))))
+        (let ((path-ref (python-imenu-tree-assoc subelement-path
+                                                 python-imenu-index-alist)))
+          (if (not path-ref)
+              (push (cons subelement-name subelement-point)
+                    python-imenu-index-alist)
+            (when (not (listp (cdr path-ref)))
+              ;; Modifiy root cdr to be a list
+              (setcdr path-ref
+                      (list (cons (format python-imenu-subtree-root-label
+                                          (car path-ref))
+                                  (cdr (assoc
+                                        (mapconcat #'identity
+                                                   subelement-path ".")
+                                        plain-index))))))
+            (when (not (assoc subelement-name path-ref))
+              (push (cons subelement-name subelement-point) (cdr path-ref))))))
+      (python-imenu-make-element-tree (cdr element-list)
+                                      full-element plain-index))))
+
+(defun python-imenu-make-tree (index)
+"Build the imenu alist tree from plain INDEX.
+
+The idea of this function is that given the alist:
+
+ '((\"Test\" . 100)
+   (\"Test.__init__\" . 200)
+   (\"Test.some_method\" . 300)
+   (\"Test.some_method.another\" . 400)
+   (\"Test.something_else\" . 500)
+   (\"test\" . 600)
+   (\"test.reprint\" . 700)
+   (\"test.reprint\" . 800))
+
+This tree gets built:
+
+ '((\"Test\" . ((\"jump to...\" . 100)
+                (\"__init__\" . 200)
+                (\"some_method\" . ((\"jump to...\" . 300)
+                                    (\"another\" . 400)))
+                (\"something_else\" . 500)))
+   (\"test\" . ((\"jump to...\" . 600)
+                (\"reprint\" . 700)
+                (\"reprint\" . 800))))
+
+Internally it uses `python-imenu-make-element-tree' to create all
+branches for each element."
+(setq python-imenu-index-alist nil)
+(mapc (lambda (element)
+        (python-imenu-make-element-tree element element index))
+      (mapcar (lambda (element)
+              (split-string (car element) "\\." t)) index))
+python-imenu-index-alist)
+
+(defun python-imenu-create-index ()
+  "`imenu-create-index-function' for Python."
+  (let ((index))
+    (goto-char (point-max))
+    (while (python-beginning-of-defun-function 1 t)
+      (let ((defun-dotted-name
+              (python-info-current-defun python-imenu-include-defun-type)))
+        (push (cons defun-dotted-name (point)) index)))
+    (if python-imenu-make-tree
+        (python-imenu-make-tree index)
+      index)))
 
 \f
 ;;; Misc helpers
 
-(defun python-info-current-defun ()
+(defun python-info-current-defun (&optional include-type)
   "Return name of surrounding function with Python compatible dotty syntax.
+Optional argument INCLUDE-TYPE indicates to include the type of the defun.
 This function is compatible to be used as
 `add-log-current-defun-function' since it returns nil if point is
 not inside a defun."
-  (let ((names '()))
+  (let ((names '())
+        (min-indent)
+        (first-run t))
     (save-restriction
       (widen)
       (save-excursion
-        (beginning-of-line)
-        (when (not (>= (current-indentation) python-indent-offset))
-          (while (and (not (eobp)) (forward-comment 1))))
-        (while (and (not (equal 0 (current-indentation)))
-                         (python-beginning-of-innermost-defun))
-          (back-to-indentation)
-          (looking-at "\\(?:def\\|class\\) +\\([^(]+\\)[^:]+:\\s-*\n")
-          (setq names (cons (match-string-no-properties 1) names)))))
+        (goto-char (line-end-position))
+        (forward-comment -9999)
+        (setq min-indent (current-indentation))
+        (while (python-beginning-of-defun-function 1 t)
+          (when (or (< (current-indentation) min-indent)
+                    first-run)
+            (setq first-run nil)
+            (setq min-indent (current-indentation))
+            (looking-at python-nav-beginning-of-defun-regexp)
+            (setq names (cons
+                         (if (not include-type)
+                             (match-string-no-properties 1)
+                           (mapconcat 'identity
+                                      (split-string
+                                       (match-string-no-properties 0)) " "))
+                         names))))))
     (when names
       (mapconcat (lambda (string) string) names "."))))
 
 (defun python-info-closing-block ()
-  "Return the point of the block that the current line closes."
+  "Return the point of the block the current line closes."
   (let ((closing-word (save-excursion
                         (back-to-indentation)
                         (current-word)))
@@ -1979,9 +2336,36 @@ character address of the specified TYPE."
       (t nil))))
 
 \f
+;;; Utility functions
+
+;; Stolen from GNUS
+(defun python-util-merge (type list1 list2 pred)
+  "Destructively merge lists to produce a new one.
+Argument TYPE is for compatibility and ignored.  LIST1 and LIST2
+are the list to be merged.  Ordering of the elements is preserved
+according to PRED, a `less-than' predicate on the elements."
+  (let ((res nil))
+    (while (and list1 list2)
+      (if (funcall pred (car list2) (car list1))
+          (push (pop list2) res)
+        (push (pop list1) res)))
+    (nconc (nreverse res) list1 list2)))
+
+(defun python-util-position (item seq)
+  "Find the first occurrence of ITEM in SEQ.
+Return the index of the matching item, or nil if not found."
+  (let ((member-result (member item seq)))
+    (when member-result
+      (- (length seq) (length member-result)))))
+
+\f
 ;;;###autoload
 (define-derived-mode python-mode fundamental-mode "Python"
-  "A major mode for editing Python files."
+  "Major mode for editing Python files.
+
+\\{python-mode-map}
+Entry to this mode calls the value of `python-mode-hook'
+if that value is non-nil."
   (set (make-local-variable 'tab-width) 8)
   (set (make-local-variable 'indent-tabs-mode) nil)
 
@@ -2010,6 +2394,8 @@ character address of the specified TYPE."
   (add-hook 'completion-at-point-functions
             'python-completion-complete-at-point nil 'local)
 
+  (setq imenu-create-index-function #'python-imenu-create-index)
+
   (set (make-local-variable 'add-log-current-defun-function)
        #'python-info-current-defun)
 
@@ -2027,6 +2413,8 @@ character address of the specified TYPE."
                              ,(lambda (arg)
                                 (python-end-of-defun-function)) nil))
 
+  (set (make-local-variable 'mode-require-final-newline) t)
+
   (set (make-local-variable 'outline-regexp)
        (python-rx (* space) block-start))
   (set (make-local-variable 'outline-heading-end-regexp) ":\\s-*\n")