Hello Lumír, From a quick look at python2-ipython, it looks like pytest is completely unnecessary at runtime. Can you please remove it from the Requires list? (Preferably in f28, with a Bodhi update)
python2-ipython-5.6.0-1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-65209cc7fd
Done also with an update to 5.6.0. Thanks for pointing this bug.
python2-ipython-5.6.0-1.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-65209cc7fd
python2-ipython-5.6.0-1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.