python auto indent problem

Question

I'm using Emacs 24.4. When writing Python code, Emacs behaves strangely with respect to indentation.

For example:

for i in range(10):
    print(i)
for i in range(10)

When I input :, Emacs adds a needless indent at the beginning of the third line. This is quite strange, is this a bug?

@VivianMaya This has nothing to do with config files, `emacs -Q` still has this problem — Hunger, Nov 09 '14 at 16:04
my friend sometimes Indentation might cross something, I had problem like this and that was about crossing definition. If you sure its nothing to do with, then I clearly don't know what is going on. — Vivian Maya, Nov 09 '14 at 16:21

score 17 · Accepted Answer · edited Nov 21 '14 at 13:57

17

This is caused by electric-indent-mode, which is enabled by default in Emacs 24.4. You can turn it off with

(electric-indent-mode -1)

If you don't want to disable electric indent mode entirely but want to stop the colon from activating electric indent mode in Python mode, then you could remove the colon character from electric-indent-chars, which Python mode gives a local value.

(add-hook 'python-mode-hook
          (lambda ()
            (setq electric-indent-chars (delq ?: electric-indent-chars))))

edited Nov 21 '14 at 13:57

Stefan

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answered Nov 09 '14 at 18:27

Kyle Meyer

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What I'd really like to see is: when the indent I've put is legal Python, LEAVE IT ALONE. electric-indent-mode mindlessly guesses what I want when I've already told it... – AdamC Jun 14 '19 at 16:53
1

And lo, these many years later, it's still broken. – AdamC Feb 18 '20 at 18:03
And lo, two more years have passed. – Edman Sep 06 '22 at 14:24

python auto indent problem

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