[Tutor] Usefulness of BIFs all() and any()?

[Richard D. Moores]

I was just perusing the Built-in Functions of Python 3.2 (<
http://docs.python.org/py3k/library/functions.html>) and was wondering
where would one ever use any() or all().

all(iterable)
Return True if all elements of the iterable are true (or if the iterable is
empty). Equivalent to:

def all(iterable):
    for element in iterable:
        if not element:
            return False
    return True

any(iterable)
Return True if any element of the iterable is true. If the iterable is
empty, return False. Equivalent to:

def any(iterable):
    for element in iterable:
        if element:
            return True
    return False

Given a = [0, 1, 2, 3],

>>> all(a)
False
>>> any(a)
True

But so what? Could I get some better examples?

And why
>>> all([])
True
>>> any([])
False

Thanks,

Dick Moores

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