PY3.C0131

Typevar double variance

Emitted when both the "covariant" and "contravariant" keyword arguments are set to "True" in a TypeVar.

Noncompliant Code:

Copy

from typing import TypeVar
T = TypeVar("T", covariant=True, contravariant=True)

Compliant Code:

Copy

from typing import TypeVar
T_co = TypeVar("T_co", covariant=True)
T_contra = TypeVar("T_contra", contravariant=True)

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