elpy and evil-mode do not react on TAB

[c.buhtz at posteo.jp]

Dear Sanel,

thanks a lot for explanation.

Am 03.11.2020 12:44 schrieb Sanel Zukan:
> this *is* expected behavior.

I assumed that. The "error" is just in front of the screen. But I tried 
to understand.

I understand and like the behaviour now. No need to re-configure 
anything.
TAB work in some very restricted situations where it is (in python 
meaning) allowed.
e.g. you type this two lines

def foo():
     """

after hitting RET the cursor is in the next (3rd) line but on first 
character/column.
Now you are allowed to hit TAB and it works a "Tab" (4 empty chars) are 
inserted. Hitting TAB again the cursor jumps back to column 1.
Great! So intelligent and powerfull. That is why I migrate (my brain) 
from vim to emacs. :D

btw: It would be great if you could add your answere here 
https://emacs.stackexchange.com/q/61497/12999