Open
Description
Bug Report
Given the following script I'm receiving several unexpected errors:
test.py:22: error: Unsupported operand types for < ("str" and "int")
test.py:22: error: Unsupported operand types for < ("int" and "str")
test.py:22: note: Both left and right operands are unions
test.py:24: error: Unsupported operand types for < ("str" and "int")
test.py:24: error: Unsupported operand types for < ("int" and "str")
test.py:24: note: Both left and right operands are unions
Found 4 errors in 1 file (checked 1 source file)
Even though the if
-block and assert statement just before the comparison operator usage on a
and b
clearly filters out the case of mismatching types. I've only added the assert
statement in the hope of telling mypy that these variables have the same type, but no luck there.
from typing import Union
def semver_prerelease_compare(lhs: str, rhs: str) -> bool:
a: Union[str, int]
b: Union[str, int]
for a, b in zip(lhs.split("."), rhs.split(".")):
try:
a = int(a)
except ValueError:
pass
try:
b = int(b)
except ValueError:
pass
if isinstance(a, int) and not isinstance(b, int):
# Numeric identifiers sort before non-numeric ones
return True
if type(a) != type(b):
return False
if a < b:
return True
elif b < a:
return False
return len(lhs) < len(rhs)