Look at this (from https://www.quora.com/Is-end1-a-keyword-in-Python-3-6-1):

print(end1 + end2 + end3 + end4 + end5 + end6 + end=' ')
         ^
SyntaxError: keyword can't be an expression

Wouldn't it be better if the message said "keyword for an argument must be a simple name"? Or something like that. Newbies, when they think of keywords, they think something from keyword.kwlist, not something used to pass arguments to a function in a particular way.