I was bitten so many times by un-indented code, thanks to copy / paste that took me hours for figure out what was the actual problem.

I wish Python had closing...how do we call them, tags(?), clauses?

Anyway, here's an example of what I mean:

Before:

    def IsPalindrome(s) -> bool:
        for i in range(len(s)):
            if s[i] != s[len(s)-1-i]:
                return False
        return True

    print("Is Anna a palindrome?", IsPalindrome('ANNa'.lower()))

after:

    def IsPalindrome(s) -> bool
        for i in range(len(s))
            if s[i] != s[len(s)-1-i]
                return False
            endif
        endfor
        return True
    enddef

    print("Is Anna a palindrome?", IsPalindrome('ANNa'.lower()))