duplicate-value / W0130#

Message emitted:

Duplicate value %r in set

Description:

This message is emitted when a set contains the same value two or more times.

Correct code:

correct_set = {'value1', 23, 5}

Problematic code:

incorrect_set = {'value1', 23, 5, 'value1'} # [duplicate-value]

Created by the basic checker.