Need Python to accept upper and lower case input

问题

I want my Python code to accept both uppercase and lowercase input.

I've tried casefold, but with no luck. Any help?

advice =""
while advice !=("Yes"):
      print("Would you like some advice!")
      advice = input("Yes or No?    ")
print("Always listen to your IT Teacher!")

I would like the input to accept Yes and yes as user input.

回答1:

You could just make advice uppercase eg.:

while advice.upper() != "YES"

This way it doesn't matter if the user inputs lower or upper case (or a mix).

来源：https://stackoverflow.com/questions/28406568/need-python-to-accept-upper-and-lower-case-input