bug#15137: python mode patch

[Daniel Elliott <danelliottster@gmail.com>]

Hello,

I'm submitting a patch that has been tremendously helpful to me.
Please consider this for addition into the next release of the world's
most excellent editor.

2013-08-19  Dan Elliott  <danelliottster@gmail.com>

        * progmodes/python.el (python-shell-send-region): added fix
suggested by Barry Warsaw for python-mode.el to fix unexpected
indentation error w\
hen sending region to interpreter



=== modified file 'lisp/progmodes/python.el'
*** lisp/progmodes/python.el    2013-08-16 05:15:51 +0000
--- lisp/progmodes/python.el    2013-08-19 21:14:34 +0000
*************** Returns the output.  See `python-shell-s
*** 2128,2134 ****
        ;; When sending a region, add blank lines for non sent code so
        ;; backtraces remain correct.
        (make-string (1- line-num) ?\n))
!     (buffer-substring start end))
     nil t))

  (defun python-shell-send-buffer (&optional arg)
--- 2128,2137 ----
        ;; When sending a region, add blank lines for non sent code so
        ;; backtraces remain correct.
        (make-string (1- line-num) ?\n))
!     ;; wrap with a conditional to avoid errors about python
unexpected indentation
!     "if True:\n"
!     (buffer-substring start end)
!     "\n")
     nil t))

  (defun python-shell-send-buffer (&optional arg)

Thank you for all of your hard work.

- dan