Q:

VS Code Python + Black formatter arguments - python.formatting.blackArgs

I'm using the May 2018 Python extension (released June 2018) for VS Code 1.23.1 on Windows, python 3.6 via Anaconda, conda installing black from conda-forge into my conda environment.   
In my user settings.json I have the below:
"python.formatting.blackArgs": [
    "--line-length 80"
],

which I'd think would be the correct way to structure this to pass arguments to black in VS Code Python formatting.   
However, in my python Output pane I get the below:
Formatting with black failed. 
Error: Error: no such option: --line-length 80

EDIT: If I edit my settings.json to be no args, such as:
"python.formatting.blackArgs": [],

black works as expected. 
Does anyone know how to pass arguments correctly to the new (as of June 2018) black formatter? 

A:

Well, I was fighting with new VSCode settings myself.  I tried all things suggested in the other answers with many variations, and result was nil. 
Then, I've reached enlightenment.  Here you are for version 1.38.1 and further.  Note there are no quotation marks. 
--line-length=80  

A:

The examples of formatter-specific settings show the following:
"python.formatting.autopep8Args": ["--max-line-length", "120", "--experimental"],
"python.formatting.yapfArgs": ["--style", "{based_on_style: chromium, indent_width: 20}"]

So try:
"python.formatting.blackArgs": ["--line-length", "80"]

A:

The proper way to config in the Settings GUI pane is with --line-length and the desired value as separate items:
Visual Studio Code GUI Settings for Python Formatting 
This converts into the settings.json into this:
Visual Studio Code JSON Settings for Python Formatting
"python.formatting.provider": "black",
"python.formatting.blackArgs": ["--line-length", "110"]

