Weird...

foo.py

#!/usr/bin/env python

import time

from contextlib import contextmanager
from itertools import repeat


def way_one():
    count = 0
    for x in repeat(None, 10000):
        count += 1
    return count


def way_two():
    for count, x in enumerate(repeat(None, 10000)):
        pass
    return count + 1


@contextmanager
def timed(description):
    start = time.time()
    yield
    end = time.time()
    print("%r took %.3f ms" % (description, (end - start) * 1000.0))

with timed("increment"):
    for _ in repeat(None, 1000):
        way_one()

with timed("enumerate"):
    for _ in repeat(None, 1000):
        way_two()

'increment' took 194.088 ms
'enumerate' took 174.236 ms