$ pip list
Package     Version
----------- -------
flake8      6.1.0
mccabe      0.7.0
pip         23.2.1
pycodestyle 2.11.0
pyflakes    3.1.0
setuptools  62.6.0

$ flake8 .  
./tests/test_crypto.py:1745:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
./tests/test_crypto.py:3153:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
./tests/test_crypto.py:3448:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
./tests/test_crypto.py:3449:16: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`
./tests/test_ssl.py:194:8: E721 do not compare types, for exact checks use `is` / `is not`, for instance checks use `isinstance()`

$ echo $?
1

$ pip list
Package     Version
----------- -------
flake8      6.0.0
mccabe      0.7.0
pip         23.2.1
pycodestyle 2.10.0
pyflakes    3.0.1
setuptools  62.6.0

$ flake8 .

$ echo $?
0