Function copy_type

mypy/copytype.py:34–42

Create a shallow copy of a type. This can be used to mutate the copy with truthiness information. Classes compiled with mypyc don't support copy.copy(), so we need a custom implementation.

(t: ProperType)

def copy_type(t: ProperType) -> ProperType:
    """Create a shallow copy of a type.

    This can be used to mutate the copy with truthiness information.

    Classes compiled with mypyc don't support copy.copy(), so we need
    a custom implementation.
    """
    return t.accept(TypeShallowCopier())


class TypeShallowCopier(TypeVisitor[ProperType]):