python-mode indentation not working upon hitting enter

Question

I just installed python-mode from ELPA and when I hit Enter the cursor goes straight to the beginning of the next line. For instance for the following code:

def hello_world():
    print "hello world!"
    for i in range(3):
        print "hello again"
    return 0

I have to hit TAB after Enter every time after I hit Enter to go to a new-line (although interestingly TAB sends the cursor to the right place).

When I installed python-mode I got some warning messages relating to indentation which I don't really understand, here is a link to those warning messages.

that last edit should be in the answers section(by adding your own answer), not the part of the original question. — Bleeding Fingers, Aug 15 '13 at 21:51
you might as well want to bring back the link to the "warning message", which you accidentally removed in your last edit ;) — Bleeding Fingers, Aug 15 '13 at 22:16

Mike Vella · Accepted Answer · 2013-11-07T21:35:43.183

4

C-j is the key I was looking for ('newline-and-indent' command). I managed to rebind Enter to this by putting the following hook in my init.el:

(add-hook 'python-mode-hook
          (lambda ()
             (define-key python-mode-map "\r" 'newline-and-indent)))

edited Nov 07 '13 at 21:35

answered Aug 15 '13 at 22:05

Mike Vella

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just for people copy-pasting the piece of code from here: it's missing one ')' from the end, which makes emacs complain about malformed init file. – J.Nieminen Nov 06 '13 at 15:02

score 3 · Answer 2 · answered Aug 16 '13 at 01:52

3

Not sure why you installed python-mode, since Emacs comes with Python support built-in, but I don't think this affects the rest. If you want RET to indent after inserting a the newline, you probably like that everywhere, so you might like to enable electric-indent-mode.

answered Aug 16 '13 at 01:52

Stefan

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cheers for the tip - My emacs version didn't have python-mode so I installed it. – Mike Vella Aug 16 '13 at 02:11
Are you sure? Emacs has had built-in support for Python since Emacs-22. – Stefan Aug 16 '13 at 04:07

Bleeding Fingers · Answer 3 · 2014-05-12T10:55:04.370

2

Try using C-j instead of enter.

Actually, C-j is bound to (newline-and-indent), which does the two steps(enter and tab)mentioned in the question.

As of version 24.4.50.1 the default behavior has been reversed i.e enter adds newline and indent if needed while C-j doesn't. Although the functions these key-bindings map to aren't as mentioned above.

edited May 12 '14 at 10:55

answered Aug 15 '13 at 21:14

Bleeding Fingers

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@MikeVella if enter did what C-j does i would find that kind of awkward. although it was otherwise at first but later on seemed logically to me. – Bleeding Fingers Aug 15 '13 at 21:20
OK, I found a discussion about C-j does in the source code. Now I'm going to try and rebind RET to C-j. – Mike Vella Aug 15 '13 at 21:21
@MikeVella I suggest you make a habit of using `C-j` for the purpose, because that way you wouldn't be a searching for a key that gives you an indentation-free-newline, having to use `M-x newline` and other not-so-simple ways of doing so. – Bleeding Fingers Aug 15 '13 at 21:39
@hus784 'newline-and-indent' does a really good job of guessing which line of indentation I want (e.g indenting after a : but not after a print statement") So I'm happy to rebind RET to that. – Mike Vella Aug 15 '13 at 21:43

python-mode indentation not working upon hitting enter

3 Answers3