in-empty-collection (RUF060)

Added in 0.15.0 · Related issues · View source

What it does

Checks for membership tests on empty collections (such as list, tuple, set, or dict).

Why is this bad?

If the collection is always empty, the check is unnecessary and can be removed.

Example

if 1 not in set():
    print("got it!")

Use instead:

print("got it!")