Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/airflow/serialization/definitions/notset.py: 67%

1# 

2# Licensed to the Apache Software Foundation (ASF) under one 

3# or more contributor license agreements. See the NOTICE file 

4# distributed with this work for additional information 

5# regarding copyright ownership. The ASF licenses this file 

6# to you under the Apache License, Version 2.0 (the 

7# "License"); you may not use this file except in compliance 

8# with the License. You may obtain a copy of the License at 

9# 

10# http://www.apache.org/licenses/LICENSE-2.0 

11# 

12# Unless required by applicable law or agreed to in writing, 

13# software distributed under the License is distributed on an 

14# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 

15# KIND, either express or implied. See the License for the 

16# specific language governing permissions and limitations 

17# under the License. 

18 

19from __future__ import annotations 

20 

21from typing import TYPE_CHECKING, TypeVar 

22 

23if TYPE_CHECKING: 

24 from typing_extensions import TypeIs 

25 

26 T = TypeVar("T") 

27 

28__all__ = ["NOTSET", "ArgNotSet", "is_arg_set"] 

29 

30 

31class ArgNotSet: 

32 """Sentinel type for annotations, useful when None is not viable.""" 

33 

34 

35NOTSET = ArgNotSet() 

36"""Sentinel value for argument default. See ``ArgNotSet``.""" 

37 

38 

39def is_arg_set(value: T | ArgNotSet) -> TypeIs[T]: 

40 return not isinstance(value, ArgNotSet)