How do I configure spacemacs for python 3?

Question

I would like to use spacemacs for python development, but I see a syntax error on Python 3 constructs, like print(*(i + 1 for i in range(n)) or async def foo():. Adding a shebang to my file (#!/usr/bin/python3 or #!/usr/bin/env python3) does not help.

What configuration changes do I need to make to use a specific python version? Ideally per-project or per-file, but global is better than nothing. I have 2.7 and 3.4 installed system-wide, and 3.5 in ~/local (~/local/bin is in my $PATH).

I don't know much about Spacemacs, but are you using virtual environments? — ChrisGPT was on strike, Dec 07 '15 at 22:19
@Chris only if the required python packages are not available in the debian repositories (so mostly no). — kai, Dec 08 '15 at 10:58
holy....... at last, I found I just does not install pylint for py3:`pip3 install pylint`, after that, everything works well. — carton.swing, Feb 01 '18 at 15:56

Robin Xing · Answer 1 · 2016-10-07T06:43:31.677

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You don't have to change spacemacs configurations. You can just use pyenv to manage python version.

Install pyenv then in terminal

$ pyenv install 3.5.1
$ pyenv global 3.5.1

Default python interpreter will be set to python 3.5.1.

$ python --version
Python 3.5.1

For more details see here.

Plus, set python-shell-interpreter to python3 may also fix the problem.

edited Oct 07 '16 at 06:43

answered Apr 26 '16 at 03:39

Robin Xing

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Where is the python-shell-interpreter variable located? – oliver Dec 02 '16 at 22:48
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@oliver Use `SPC h d v` you can check the variable's current value. You could change it in your configurations directly by set this variable to another value. – Robin Xing Dec 22 '16 at 13:22
FWIW, setting `python-shell-interpreter` fixed issues I had where the wrong python version was used – Fredrik Håård May 26 '20 at 15:55

score 5 · Accepted Answer · answered Aug 08 '17 at 13:22

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The variable that needed to be set was flycheck-python-pycompile-executable, to "python3".

To get support for async, emacs25 must be used (note debian will install emacs24 and emacs25 side-by-side, and use emacs24 by default).

answered Aug 08 '17 at 13:22

kai

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How do you set that variable and where should you set it? – oliver Oct 11 '18 at 03:15
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The easiest way is `SPC-SPC`, `customize-variable`, `flycheck-pycompile-executable`. I'm sure it can be set in your dotfile, check [the docs](https://github.com/syl20bnr/spacemacs/blob/master/doc/DOCUMENTATION.org) for that. – kai Oct 11 '18 at 22:23

How do I configure spacemacs for python 3?

2 Answers2