genexp performance problem?

[Giovanni Bajo]

Fredrik Lundh wrote:

>> I found this strange:
>>
>> python -mtimeit "sum(int(L) for L in xrange(3000))"
>> 100 loops, best of 3: 5.04 msec per loop
>>
>> python -mtimeit "import itertools; sum(itertools.imap(int,
>> xrange(3000)))" 100 loops, best of 3: 3.6 msec per loop
>>
>> I thought the two constructs could achieve the same speed.
>
> hint: how many times to the interpreter have to look up the names
> "int"
> and "L" in the two examples ?

Ah right, thanks!
-- 
Giovanni Bajo