import timeit

s = list([i for i in range(1000)])


def v1(l):
    for k, v in enumerate(l):
        pass
    return l


def v2(l):
    for i in range(len(l)):
        pass
    return l

setup = """
from __main__ import v1, v2, s
"""

print("Enumerate: %s" % timeit.timeit('v1(s)', setup=setup))
print("Range: %s" % timeit.timeit('v2(s)', setup=setup))

"""
==========Results:
Enumerate: 22.7995829582
Range: 14.351061821
"""