Format on save doesn't work for black when using conda run

Environment data

• VS Code version: 1.41.1
• Extension version (available under the Extensions sidebar): 2020.1.57204
• OS and version: Windows 10 / CentOS 7.5 (tried on both)
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.3.final.0 (Anaconda3)
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): N/A
• Relevant/affected Python packages and their versions: N/A
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info #3977): jediEnabled set to true

Steps to Reproduce:

1. Install Black for Python pip install black:
2. Edit the following settings in settings.json:

"python.formatting.blackArgs": [
        "--line-length",
        "100"
    ],
"editor.formatOnSave": true,
"python.formatting.provider": "black",

1. Create a file with the following content:

dict(
    foo="bar",
    foo4="bar",foo5="bar"
)

1. Save the file (name it: black_bug.py). The file contents do not change, but the expected results was for the file to be changed to:

dict(foo="bar", foo4="bar", foo5="bar")

(the same as executing black --line-length 100 black_bug.py)

I do see that the following command has been executed in the console (output > Python)

conda run -n base python -m black --line-length 100 --diff --quiet ~/black_bug.py
cwd: ~

The same problem happens when using autopep8 or other formatter

[karrtikr]

I am able to reproduce the issue, thanks. The issue happens only with the conda interpreter, so you can select some other interpreter as a workaround.

It will be fixed along with https://github.com/microsoft/vscode-python/issues/9490.

[karrtikr]

Closing as fixed according to https://github.com/microsoft/vscode-python/issues/9487#issuecomment-572816972