Is there a faster way to do this?

Roy H. Han starsareblueandfaraway at
Wed Aug 6 04:41:15 CEST 2008

Why not just use sets?

a = set()

On Tue, Aug 5, 2008 at 10:14 PM, RPM1 <rpm9deleteme at> wrote:
> ronald.johnson at wrote:
>> I have a csv file containing product information that is 700+ MB in
>> size. I'm trying to go through and pull out unique product ID's only
>> as there are a lot of multiples. My problem is that I am appending the
>> ProductID to an array and then searching through that array each time
>> to see if I've seen the product ID before. So each search takes longer
>> and longer. I let the script run for 2 hours before killing it and had
>> only run through less than 1/10 if the file.
> I think you need to learn about Python's dictionary data type.
> --

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