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I am using elpy for my Python development, but I would like to set the per-line character limit to 120 instead of the default 80 used by PEP8. Any suggestions on how I can do this? Even better, it would be great if I can customize this setting on a per-project basis.

I have tried the following:

  • M-x customize-group elpy
  • M-x customize-mode elpy-mode
  • M-x customize-mode python-mode

but I can't seem to find the option that customizes the line character limit.

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  • I suspect you want fill-column.
    – Dan
    Jun 13, 2016 at 1:13
  • @Dan can you elaborate a bit? I tried setting fill-column (M-x set-fill-column and via M-x customize-variable fill-column), but elpy still shows an error for lines longer than 79 characters, with the message E501 line too long (81 > 79 characters). I tried refreshing the buffer too, but no luck. Any suggestions?
    – modulitos
    Jun 13, 2016 at 3:41
  • This seems like something that needs to be set through the flake8 config file or through the autopep8 config file depending on what you want. Take a look at the configuration page flake8.readthedocs.io/en/latest/config.html
    – Jules
    Jun 13, 2016 at 14:36

1 Answer 1

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If you want to customize per project basis, you can create a setup.cfg with custom config like this

[flake8]
max-line-length = 160

If you want to change this globally, you can change flake8 config as mentioned here https://flake8.pycqa.org/en/latest/user/configuration.html#user-configuration

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  • Thank you very much! It's exactly what I needed, and now I see that I can use the flake8 config for my elpy-mode. It makes sense, because I believe elpy uses flake8 as the default syntax checker under the hood.
    – modulitos
    Jun 13, 2016 at 19:48
  • 5
    That link is dead - this seems like the current version: https://flake8.readthedocs.io/en/latest/user/configuration.html#user-configuration
    – n1k31t4
    Feb 9, 2018 at 16:16
  • Would someone please tell me how this file is supposed to be created if it doesn't exist? And what's the path?
    – Qohelet
    Mar 24, 2021 at 17:59
  • @Qohelet You can manually create the file and add the required sections to it. By default, it should be in your project root directory. docs.python.org/3/distutils/configfile.html Mar 25, 2021 at 3:47
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    @ChillarAnand - tried it and it doesn't work, that's how I came here. Emacs still complains
    – Qohelet
    Mar 25, 2021 at 19:46

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