typevar-name-incorrect-variance / C0105

Message emitted:

Type variable "%s" is %s, use "%s" instead

Description:

Emitted when a TypeVar name doesn't reflect its type variance. According to PEP8, it is recommended to add suffixes '_co' and '_contra' to the variables used to declare covariant or contravariant behaviour respectively. Invariant (default) variables do not require a suffix. The message is also emitted when invariant variables do have a suffix.

Created by basic checker