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In Python mode (python.el), I am in the habit of hitting C-j to return and indent properly. However, when I am in an inferior python buffer, this command only inserts a newline and does not indent. Is there any way to get the inferior-python-mode to work more like python-mode in this respect, or maybe even set up auto-indent the way it normally works in ipython? I have read through the documentation for inferior-python-mode, but can't find anything useful. I love using Emacs for Python, but there are a few pain points, and I am having trouble finding good documentation. Thanks in advance for any advice!

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  • 10 years old question looking for a good answer. Commented Aug 21 at 11:52

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The problem is that newline-and-indent (the function that C-j is bound to) inserts a literal newline then whatever would be inserted by TAB. What you want is to send the current input:

(defun send-input-and-indent ()
  (interactive)
  (comint-send-input)
  (indent-for-tab-command))

Next, bind send-input-and-indent to C-j only when in inferior-python-mode:

(define-key inferior-python-mode-map (kbd "C-j") 'send-input-and-indent)

Put both snippets in your initialization file and you're good to go.

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  • Nah - that only works if you press it at the end of a line, and even then the indentation settings from python-mode are not obeyed. But, for example if you have def f(a=1,^ b=2): and the cursor is at position ^, it will produce rubbish that can only be stopped with C-c C-c. Commented Aug 21 at 11:49
  • Also note C-j is bound to 'electric-newline-and-maybe-indent in inferior-python-mode. Commented Aug 21 at 12:10

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