$ ./run_tests.sh -N -p this command will use the "flake8" program installed in our host.
$ ./run_tests.sh -p this command will use the "flake8" installed in the virtualenv.
The two version of flake8 may be different. so the result may be different.
$ ./run_tests.sh -N -p
this command will use the "flake8" program installed in our host.
$ ./run_tests.sh -p
this command will use the "flake8" installed in the virtualenv.
The two version of flake8 may be different. so the result may be different.