Test the three algorithms for iterating on a zipped sliced lists

Iterating on zipped list slices

import timeit
from itertools import izip, islice
data = range(0,100000)

def loop1():
    return zip(data[::2],data[1::2])

def loop2():
    return izip(data[::2],data[1::2])

def loop3():
    return izip(islice(data,0,None,2),islice(data,1,None,2))
        
def todict1():
    return dict(loop1())

def todict2():
    return dict(loop2())

def todict3():
    return dict(loop3())
    

if __name__=='__main__':
    '''The fastest is loop2. The islice iterator is slower than slicing the list (what is the point of it!!).'''
    t = timeit.Timer("todict1()", "from __main__ import todict1")
    print('old loop: %s' % t.timeit(100))
    t = timeit.Timer("todict2()", "from __main__ import todict2")
    print('new loop: %s' % t.timeit(100))
    t = timeit.Timer("todict3()", "from __main__ import todict3")
    print('new loop: %s' % t.timeit(100))