The Python Coding Nightmare Called Ebook Formats

I am making a converter in python converter partly by converting 63 ebook formats into each other. There is one problem, I do not know how to convert these formats! If you have any tutorials or libraries in a library-style manner for converting any of the formats in that list into any of the others I will be grateful!

The list is below (in Github) and I did not create it:
VisuaFiles/Ebook.txt at 0fb51d3e742f8625c34e5715418eaa8237b49168 · Fossilia/VisuaFiles (github.com)