在Python中生成临时URL

I've been trying to generate a temporary url in python, the url will some data that i need to make sure isn't changed so i'll add a hash in the end but i keep ending with a bString no matter what i try, can anyone point out what i'm doing wrong? Here's a sample of my code oh and i know that maybe changing the algorithms/encoding might solve the problem but i can't find a suitable one, can any downvoter explain why he downvotedI've been trying to generate a temporary url in