pylint-errors
W1508 (invalid-envvar-default)
Problematic code:
import os
env = os.getenv('SECRET_KEY', 1)
Correct code:
import os
env = os.getenv('SECRET_KEY', '1')
Rationale:
Env manipulation functions return None or str values. Supplying anything
different as a default may cause bugs. See
https://docs.python.org/3/library/os.html#os.getenv for more details.