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

by 
def foo(s):
    ret = ""
    i = True  # capitalize
    for char in s:
        if i:
            ret += char.upper()
        else:
            ret += char.lower()
        if char != ' ':
            i = not i
    return ret

>>> print foo("hello world")
HeLlO wOrLd'

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