help with plt.fill_between

[Larz60+]

Lions, Tigers and Bears. Oh my!

This is some of the most awful code to look at!

maybe using do loops

they are called for loops in python.

Do you have the specs?
It might be easier to rewrite.

Also, when posting error, please include the full traceback as there is
important information to help with debugging, including line number of the
code causing the error.