The python3-flake8 package uses but does not specify a dependency on: python3-setuptools python3-pep8 python3-mccabe python3-pyflakes That may also be the case for the python2 version though I did not check.
python-flake8-2.0-5.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/python-flake8-2.0-5.fc20
the dependency has been added to 2.0-5
Package python-flake8-2.0-5.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing python-flake8-2.0-5.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-0103/python-flake8-2.0-5.fc20 then log in and leave karma (feedback).
python-flake8-2.0-5.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.