I started using CPython as I wanted to have the advantages of the openpyxl library. And I am really happy about the opportunity to use it.
What I could observe now, is that the discription that I wrote for the title and the tooltips in the very beginning of my script, would not appear in Revit:
#! python3
__title__ = "Name of the Tool"
__doc__ = "Description about tool when hovering over the Button"
Is there a correlation between CPython and these commands? When I do not use CPython it works.