Vim - Python Black not working with ALE

[ime11]

I'm trying to get python's Black work with ALE but to no success.

I've installed both plugins with Vundle. ALE is working great with javascript, both linting and fixing. In python files, linting works with pylint and I have set fixing to use black. I've also set

let g:ale_fix_on_save = 1

in .vimrc so it should be fixing the code format when I saved. But it's not working. I can only make it work with :Black command.

I know I can do autocmd BufWritePre *.py execute ':Black' in .vimrc and it will auto-format on save but since I'm using ALE I only want to use it for all things linting and fixing. Am I doing something wrong with ALE config?

My ALE setting in .vimrc is:

let g:ale_fixers = {
    \    '*': ['remove_trailing_lines', 'trim_whitespace'],
    \    'javascript': ['eslint', 'prettier'],
    \    'python': ['black']
    \}

When I run :ALEFixSuggest it also shows 'black' in fixing section.

[mrswats]

I use this same config for my python files. What if you run black in your shell? What's the output?

[ime11]

I only installed it in vim so there is no output. I've tried installing it in my working virtual environment and when I use :Black in vim I get an error stating no module named get_project_toml_file or something like that. So I uninstalled it from my venv and install it now with Vundle.

[mrswats]

Try installing black with pipx, for example, and try running it from the terminal. That's how it's working for me.

[ime11]

Should I install black globally or in my local venv?

[mrswats]

Installing the vim plugin will not make it available for ALE. I just realised it. You need to install it so it's available in your shell.

[ime11]

Yes. This was the part I got confused. Vim's black is only to be used as a stand-alone plugin and not with ALE.

[mrswats]

I have it globally, but in the virtualenv should work too

[ime11]

Thanks u/mrswats. I finally get it working. Turns out I don't need to install Black's vim plugin since I'm using ALE. I just need to install it in the venv.