redeclared-assigned-name (PLW0128)

Derived from the Pylint linter.

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

What it does

Checks for declared assignments to the same variable multiple times in the same assignment.

Why is this bad?

Assigning a variable multiple times in the same assignment is redundant, as the final assignment to the variable is what the value will be.

Example

a, b, a = (1, 2, 3)
print(a)  # 3

Use instead:

# this is assuming you want to assign 3 to `a`
_, b, a = (1, 2, 3)
print(a)  # 3