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repeated-equality-comparison (PLR1714)#

Derived from the Pylint linter.

Fix is always available.

What it does#

Checks for repeated equality comparisons that can rewritten as a membership test.

Why is this bad?#

To check if a variable is equal to one of many values, it is common to write a series of equality comparisons (e.g., foo == "bar" or foo == "baz").

Instead, prefer to combine the values into a collection and use the in operator to check for membership, which is more performant and succinct. If the items are hashable, use a set for efficiency; otherwise, use a tuple.


foo == "bar" or foo == "baz" or foo == "qux"

Use instead:

foo in {"bar", "baz", "qux"}