def patch(fn, attr_or_replacement, replacement=None):
    """pass"""
    if replacement is None:
        replacement = attr_or_replacement
        return when2(fn, Ellipsis).thenAnswer(replacement)
    else:
        obj, name = (fn, attr_or_replacement)
        theMock = _get_mock(obj, strict=True)
        return invocation.StubbedInvocation(theMock, name, strict=False)(Ellipsis).thenAnswer(replacement)