iteration-over-set (PLC0208)

Derived from the Pylint linter.

Fix is always available.

What it does

Checks for iteration over a set literal where each element in the set is itself a literal value.

Iterating over a set is less efficient than iterating over a sequence type, like list or tuple.

for number in {1, 2, 3}:
    ...

Use instead:

for number in (1, 2, 3):
    ...