Generator slower than iterator?

[Federico Moreira]

The defaultdict option looks faster than the standard dict (20 secs aprox).

Now i have:

#############################
import fileinput
import sys
from collections import defaultdict

match_counter = defaultdict(int)

for line in fileinput.input(sys.argv[1:]):
    match_counter[line.split()[0]] += 1
#############################

About generators, now i get the idea of when use them and when not.

Thanks MRAB, Lie and Gary.
Now not only is faster but also cleaner and easy to understand =)
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