The following code:
from typing import Literal, Tuple, Union
x: bool = False
def f() -> Union[Tuple[Literal[True], int], Tuple[Literal[False], str]]:
if x:
return (True, 5)
else:
return (False, 'oops')
print(f())produces the following ouput:
$ python3 test.py
(False, 'oops')
$ mypy test.py
test.py: note: In function "f":
test.py:7:16: error: Incompatible return value type (got "Tuple[bool, int]", expected "Union[Tuple[Literal[True], int], Tuple[Literal[False], str]]") [return-value]
return (True, 5)
^
test.py:9:16: error: Incompatible return value type (got "Tuple[bool, str]", expected "Union[Tuple[Literal[True], int], Tuple[Literal[False], str]]") [return-value]
return (False, 'oops')
^
Found 2 errors in 1 file (checked 1 source file)
$ mypy --version
mypy 0.910
$ python3 --version
Python 3.8.10
$ cat /etc/issue
Ubuntu 20.04.3 LTS \n \l
$ uname -a
Linux ubuntu 5.4.0-88-generic #99-Ubuntu SMP Thu Sep 23 17:29:00 UTC 2021 x86_64 x86_64 x86_64 GNU/LinuxFrom my point of view, the code looks correct, and mypy should not object.
The following code:
produces the following ouput:
From my point of view, the code looks correct, and
mypyshould not object.