empty lists vs empty generators

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Starting from Python 2.4 we have tee in the itertools
module, so you can define the following:

from itertools import tee

def is_empty(it):
    it_copy = tee(it)[1]
    try:
        it_copy.next()
    except StopIteration:
        return True
    else:
        return False

It works with generic iterables too.

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