unintentional-type-annotation (B032)

Derived from the flake8-bugbear linter.

What it does

Checks for the unintentional use of type annotations.

Why is this bad?

The use of a colon (:) in lieu of an assignment (=) can be syntactically valid, but is almost certainly a mistake when used in a subscript or attribute assignment.

Example

a["b"]: 1

Use instead:

a["b"] = 1