szip.py

class szip:
    def __init__(self, *sequences):
        self.sequences = sequences

    def __len__(self):
        return min(len(seq) for seq in self.sequences)

    def __getitem__(self, index):
        if isinstance(index, slice):
            return szip(*(seq[index] for seq in self.sequences))
        else:
            return tuple(seq[index] for seq in self.sequences)

    def __contains__(self, item):
        return item in zip(*self.sequences)

    def __iter__(self):
        return zip(*self.sequences)

    def __repr__(self):
        return '<szip object at 0x{:x}>'.format(id(self))

>>> from szip import szip
>>> import random
>>> 
>>> a = [1,2,3,4,5]
>>> b = [4,5,6,7]
>>> z = szip(a, b)
>>> len(z)
4
>>> 
>>> random.choice(z)
(2, 5)