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

Answer 1

I think this is one of those cases where a regular for-loop is the best idea:

>>> def f(s):
...     r = ''
...     b = True
...     for c in s:
...         r += c.upper() if b else c.lower()
...         if c.isalpha():
...             b = not b
...     return r
...
>>> f('Hello world')
'HeLlO wOrLd'