Infinite loop on unclosed parenthesis

[andersk]

If I run isort (5.10.1 or main at c6a4196) on this invalid file with an unclosed parenthesis, it goes into a 100% CPU infinite loop:

from os import (

[anirudnits]

I'm looking into this. Just as a workaround using --atomic flag for such files will raise an error and prevent isort to go into an infinite loop.

[anirudnits]

this while condition

isort/isort/core.py

Line 304 in c6a4196

while ")" not in stripped_line:

seems to be going into infinite loop. There should be way to identify if we are at the end of a stream and raise an error if so.