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cast gives cryptic error: Invalid type "self" #6862
Description
-
Are you reporting a bug, or opening a feature request?
Bug -
Please insert below the code you are checking with mypy,
or a mock-up repro if the source is private. We would appreciate
if you try to simplify your case to a minimal repro.
from typing import *
Integer = NewType("Integer", int)
class Foo:
_bar: Integer
def __init__(self, val: int) -> None:
self._val = val
self._bar = cast(self._val, self._bar)- What is the actual behavior/output?
type.py:11: error: Invalid type "self" - What is the behavior/output you expect?
An error message that explains that you cannot cast to an instance of a type. - What are the versions of mypy and Python you are using?
Do you see the same issue after installing mypy from Git master?
mypy 0.701
python 3.7.3 - What are the mypy flags you are using? (For example --strict-optional)
mypy.iniis as follows.
[mypy]
mypy_path = stubs
warn_unused_ignores = True
warn_return_any = True
strict_optional = True
no_implicit_optional = True
disallow_any_unimported = True
#disallow_any_expr = True
#disallow_any_decorated = True
disallow_any_explicit = True
disallow_subclassing_any = True
disallow_any_generics = True
disallow_untyped_calls = True
disallow_untyped_defs = True
disallow_incomplete_defs = True
disallow_untyped_decorators = True
check_untyped_defs = True
Activity
gvanrossum commentedon May 18, 2019
I wonder if using ‘self.something’ in other places that need a type give the same error.
ilevkivskyi commentedon May 19, 2019
This is a duplicate of a more general issue #4030. I prefer to track this in "centralized" way, so closing this one.