Capitalise every other letter in a string in Python? [closed]

Answer 1

Here is a version that uses regular expressions:

import re

def alternate_case(s):
    cap = [False]
    def repl(m):
        cap[0] = not cap[0]
        return m.group(0).upper() if cap[0] else m.group(0).lower()
    return re.sub(r'[A-Za-z]', repl, s)

Example:

>>> alternate_case('Hello world')
'HeLlO wOrLd'