Recursive mode?

[alok]

Currently I run pyupgrade with something like find ... | xargs pyupgrade. A recursive flag to drill down directories would be nice (and in line with a lot of other formatters like black, yapf, and isort).

[asottile]

instead I'd suggest leveraging pre-commit -- implementing --recursive opens a whole can of worms with --include / --exclude / parsing shebangs / whitelists / blacklists that I'm really not interested in re-implementing. Fortunately, pre-commit is great at running linters / fixers and already supports this.

[asottile]

and if you need a "run once" mode, I'd suggest pre-commit try-repo https://github.com/asottile/pyupgrade --all-files

[alok]

Oh that's neat! I didn't know about the --all-files option. That's perfect.

[impredicative]

To offer some contrast, I think using https://pre-commit.com/ opens a whole can of worms, and it's shameless to need to require it. The following is simple and works in Bash:

shopt -s globstar
pyupgrade ./**/*.py