dict is really slow for big truck

Scott David Daniels Scott.Daniels at Acm.Org
Wed Apr 29 22:07:03 CEST 2009


MRAB wrote:
> Scott David Daniels wrote:
>> Bruno Desthuilliers wrote:
>>> d = {}
>>> for line in open(thefile):
>>>    arr = line.strip().split()
>>>    d[arr[0]] = arr
>>
>> Sorry, not picking on Bruno in particular, but I keep seeing
>> this formulation around various places.
>> When does line.strip().split() ever differ from line.split()?
> ... <explanation of what split does>

You misunderstand the question.  For what values of line is
the following expression False?

     line.strip().split() == line.split()

If you know of one, I'd like to hear of it.  If not, I assert
that (baring some incredibly over-ambitous optimizer operations)
     line.strip().split()
is simply an inefficient (both performance and text) way of saying:
     line.split()

--Scott David Daniels
Scott.Daniels at Acm.Org



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