Switch Python Version for Vim & Syntastic

2019-02-07 23:51发布

Is it possible to change the python version used by syntastic for syntax checking?

As the Issue https://github.com/scrooloose/syntastic/issues/385 indicates I could use virtual-env. But is it also possible just with syntastic or vim commands?

8条回答
唯我独甜
2楼-- · 2019-02-08 00:19

In spite of all the answers here, I still find the recommendation from the FAQ to be the best. I have added this to my .vimrc so that I can easily switch between python versions.

function Py2()
  let g:syntastic_python_python_exec = '/usr/local/bin/python2.7'
endfunction

function Py3()
  let g:syntastic_python_python_exec = '/usr/local/bin/python3.6'
endfunction

call Py3()   " default to Py3 because I try to use it when possible

With those functions installed, it's easy to switch python version right within vim with :call Py2() or :call Py3() depending on what I need at the moment. No need to exit vim and activate a different virtualenv as the popular answer would have you do.

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疯言疯语
3楼-- · 2019-02-08 00:20

The below is no longer necessary, and might screw up if you're forced to work on a strictly python 2.x script.

The best option is to leave the Syntastic defaults alone, and to use conda to manage separate environments for python 3 and 2 (each with their own version-specific installs of flake8, pyflakes, etc), and to switch to the appropriate environment to edit each file. Syntastic will then call python/flake8/whatever else according to the paths set in the activated environment.


From the Syntastic repository README:

Q. The python checker complains about syntactically valid Python 3 constructs...

A. Configure the python checker to call a Python 3 interpreter rather than Python 2, e.g:

let g:syntastic_python_python_exec = '/path/to/python3'

Add that line to your .vimrc - that should fix your problem.

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Emotional °昔
4楼-- · 2019-02-08 00:20

I managed to convince Syntastic to handle Python 3 syntax with

pip3 install --user flake8

(to make python3 -m flake8 *.py work) and then, in vim:

let g:syntastic_python_flake8_exec = 'python3'
let g:syntastic_python_flake8_args = ['-m', 'flake8']
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地球回转人心会变
5楼-- · 2019-02-08 00:23

If you working under virtualenv, you can use a script that detects current python version and invokes flake8 accordingly. Put the following somewhere in your path and name is flake8.sh:

#!/bin/sh
PYMAJOR=$(python --version | awk '{print $2}'| awk -F. '{print $1}')
exec /usr/bin/python$PYMAJOR /usr/bin/flake8 $*

Now in you vimrc add:

let g:syntastic_python_flake8_exe='flake8.sh'

Also make sure that both python-flake8 and python3-flake8 (on Ubuntu) are installed.

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我欲成王,谁敢阻挡
6楼-- · 2019-02-08 00:26

Not really, but you can get the python3 incompatible warning by install this package.

Let's say your current Syntastic Python checker is python and you want to get python3 incompatible warning. In command mode, you can add py3kwarn to g:syntastic_python_checkers by

:let g:syntastic_python_checkers=['python', 'py3kwarn']

and switch to python2.x only

:let g:syntastic_python_checkers=['python']
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Luminary・发光体
7楼-- · 2019-02-08 00:31

Considering that this question is the first result that appears when searching Google for "Syntastic python3", I have the impression that most answers are too complicated for someone in a hurry, and I feel compelled to add a new one. The straightforward solution to switch to python3 is to put

let g:syntastic_python_checkers = ['python3']

in your .vimrc. One might argue that this is not the best solution, but the question is so vague that is seems necessary to begin with simple things.

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