script files with python (instead of tcsh/bash)?

Esmail ebonak at hotmail.com
Wed Mar 25 13:34:18 CET 2009


Peter Otten wrote:
>
>> In this case I believe I needed the contents in a list because the line
>> I was looking for was above one that I could easily identify. Ie, once
>> I had the index, I could go back/up one index to find the line I needed
>> to process.
> 
> Here's one way to avoid the list:
> 
> last_line = None
> for line in f:
>     if "somestring" in line and last_line is not None:
>          # do something with last_line
>     last_line = line
> 
> Peter


yup .. this will come in handy in case the file is too
big and or really needn't be all in memory. cool. thanks!

Esmail




More information about the Python-list mailing list