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single-item-membership-test (FURB171)#

Derived from the refurb linter.

Fix is sometimes available.

This rule is unstable and in preview. The --preview flag is required for use.

What it does#

Checks for membership tests against single-item containers.

Why is this bad?#

Performing a membership test against a container (like a list or set) with a single item is less readable and less efficient than comparing against the item directly.


1 in [1]

Use instead:

1 == 1