For arbitrary types, repr(type(obj)) is not guaranteed to be of any particular form. Thus, you can't assume that the regex will match something, and therefore the match[0] call needs to be put under a check to make sure that match actually contains something first.
As an example of a type repr that doesn't conform to what you are expecting in the standard library:
from typing import TypeVar
x = TypeVar("x")
print(type(x)) # prints "typing.TypeVar"
nvdv
commented
6 years ago
For arbitrary types,
repr(type(obj))is not guaranteed to be of any particular form. Thus, you can't assume that the regex will match something, and therefore thematch[0]call needs to be put under a check to make sure thatmatchactually contains something first.As an example of a type repr that doesn't conform to what you are expecting in the standard library: