ImportError: No module named 'flake8.engine'

[jaraco]

Running pytest-flake8 against the latest flake8 (3.0.0b2), it fails with the error in the title. It appears that flake8 has moved the flake8.engine module.

When using easy_install to install pytest-flake8, it doesn't protect against pre-releases, so the requirements on pytest-flake8 pick up the incompatible beta release. Perhaps pytest-flake8 should depend on flake8>=2.5,<3dev until compatibility code can be added for flake8 3.0 support.

[santagada]

Now flake8 3.0.0 has been released so pytest-flake8 is broken