Error occurred when sending an indented cell

[bamanzi]

When sending an indented cell (e.g. a block in a method of a class), Python shell would throw IndentationError: unexpected indent

I figured out a hack to fix this problem( by prefixing a line 'if True:\n'):

(defun python-shell-send-cell ()
 "Send the cell the cursor is in to the inferior Python process."
 (interactive)
 (let* (
 (start (save-excursion (python-beginning-of-cell)
 (point)))
 (end (save-excursion (python-end-of-cell)
 (point)))
 (content (buffer-substring start end))

 (preline "if True:\n")

 (line-num (line-number-at-pos start))
 ;; When sending a region, add blank lines for non sent code so
 ;; backtraces remain correct. 
 (postline (make-string (1- line-num) ?\n)))
 ;;(message "DEBUG: %s" (substring content 0 4))
 (python-shell-send-string (concat (if (string= (substring content 0 2) " ")
 preline
 "")
 content
 postline))))