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check-and-remove-from-set (FURB132)#

Derived from the refurb linter.

Fix is always available.

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

What it does#

Checks for uses of set.remove that can be replaced with set.discard.

Why is this bad?#

If an element should be removed from a set if it is present, it is more succinct and idiomatic to use discard.

Known problems#

This rule is prone to false negatives due to type inference limitations, as it will only detect sets that are instantiated as literals or annotated with a type annotation.


nums = {123, 456}

if 123 in nums:

Use instead:

nums = {123, 456}