Remove trailing whitespace

[pylang]

Is your feature request related to a problem?

Running black (in VSCode) does not remove trailing whitespaces.

s = 'Hello world!"_ _

Describe the solution you'd like

Rather, I'd like black to remove trailing whitespace on all lines.

s = 'Hello world!"

Describe alternatives you've considered

I have to do a followup "Trim Whitespace" command in VSCode. I'd like this to be part of black by default.

There are some prior issues (#567) regarding trailing whitespace inside strings. Removing trailing whitespace by default can clean up code and even save some wasted space.

[msgongora]

this can be fixed using vscode feature instead:

settings.json

"[python]": {
        "files.trimTrailingWhitespace": true,
    },
...

[ichard26]

Black already does this.

richard-26@ubuntu-laptop:~/programming/tools/ghprcl$ black test.py
reformatted test.py
All done! ✨ 🍰 ✨
1 file reformatted.
richard-26@ubuntu-laptop:~/programming/tools/ghprcl$ diff -u --color orig.py test.py
--- orig.py 2020-07-28 17:45:02.959401063 -0400
+++ test.py 2020-07-28 17:44:46.307273954 -0400
@@ -1 +1 @@
-s = "Hello world!"  
+s = "Hello world!"

BEFORE

and AFTER

This seems like a problem with how Visual Studio Code handling of diffs. Maybe related to this?

---

Environment:

• OS version: Ubuntu 18.04.04 LTS
• Python version: CPython 3.8.1
• Black version: 19.10b0

[JelleZijlstra]

Closing as this is most likely an issue with VSCode, not Black.

[rjurney]

Try these in <project_root>/.vscode/settings.json:

{
    "python.formatting.provider": "black",
    "[python]": {
        "files.trimTrailingWhitespace": true,
        "editor.formatOnSave": true
    }
}