How to setup Neomake with Python?

Question

I recently switched to Neovim and was trying to install the code checking plugin 'Neomake'. I followed the instructions for the setup in my vimrc. The plugin seems to run fine but the error list was not populated with errors even when I put in intentional errors.

A section of my vimrc:

let g:neomake_python_flake8_maker = {
    \ 'exe': 'python3.4',
    \ 'errorformat': '%A%f: line %l\, col %v\, %m \ (%t%*\d\)',
    \ }
let g:neomake_python_enable_makers = ['flake8']

So how can I setup neomake properly with Python 2/3 support? Preferably using Flake8 as the checker.

Answer 1

I just had the same problem as soon as I started adding options, I had to copy the error format from the plugin code to my options:

let g:neomake_python_flake8_maker = {
    \ 'args': ['--ignore=E221,E241,E272,E251,W702,E203,E201,E202',  '--format=default'],
    \ 'errorformat':
        \ '%E%f:%l: could not compile,%-Z%p^,' .
        \ '%A%f:%l:%c: %t%n %m,' .
        \ '%A%f:%l: %t%n %m,' .
        \ '%-G%.%#',
    \ }
let g:neomake_python_enabled_makers = ['flake8']

Answer 2

In my case I setup all my dev environments like a virtualenv, using pyenv. For errors and warnings, I put pylama inside my virtualenv (come in my requirements.txt) and pylama requires mccabe, pep257, pep8 and pyflakes. All this are probed by neomake.

With this setup, pylama give me alerts from all these integrated, no extra settings needed. But I must remember to always have active the virtualenv before running neovim for the IDE to work.

UPDATE: you can check here:

https://github.com/neomake/neomake/blob/master/autoload/neomake/makers/ft/python.vim

that pylama is supported by pymake for default.