* PyCharm version in extra variable
* new software:
  * neovim
  * ptpython3
  * python3-mypy

* matplotlib < 2 has got a bug with the Qt5 backend which makes it
unusable, see the issue at https://github.com/matplotlib/matplotlib/pull/6854
* Work around: istall python3-matplotlib-qt4 instead

* Add pre-commit
* Add dependencies
* Begin to avoid the ansible YAML short hand notation

* Mostly Python 3
* Many packages are (nearly) up-to-date in Fedora 25 in comparisson with
* ipynb role for IPython notebooks
* pyhon_stack for the common scipy-stack

pip, so I use these packages.