How to remove trailing comma?

[michaelxswe]

Before applying the formatter

def method(arg1, arg2, arg3, ..., arg10):

After applying the formatter

def method(
    arg1,
    arg2,
    arg3,
    ...,
    arg10,
)

Is there a way to configure the ruff formatter to remove the trailing comma next to arg10?

Maybe by passing an argument to

"ruff.format.args": ["remove-trailing-comma"]

[tjkuson]

The Ruff formatter tries to follow the Black code style, which adds a trailing comma. A configuration option has not been added to Ruff to change that behaviour (it would have to be a new feature).

[michaelxswe]

Thanks for the info!

[heiner]

Here's a reason a flag to suppress trailing commas might be useful: It turns ruff format into a quite decent json formatting engine. E.g.,

cat file.json | ruff format - --isolated --config indent-width=2

However, sadly trailing commas aren't legal JSON.

[mgaitan]

use jq, dude