Implement function ion() that takes a string as input and returns True if the entered string ends in 'ion' and false otherwise.
ion('congratulation')
True
ion('marathon')
False
How can I start this off and Finish it?

Hint ...

s = "question"

print(s.endswith("ion"))  # True

WHAT'S THE UPPERCASE SITUATION?

commented: No sense -3

You can give endswith() a tuple of choices, for instance
s.endswith(("ion", "ION"))

But if you are concerned on case of the word, I would use the lower() method of strings.

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