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Re: Processing a large string

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On Thu, 11 Aug 2011 19:03:36 -0700, goldtech wrote:

> Say I have a very big string with a pattern like:
> 
> akakksssk3dhdhdhdbddb3dkdkdkddk3dmdmdmd3dkdkdkdk3asnsn.....
> 
> I want to split the sting into separate parts on the "3" and process
> each part separately. I might run into memory limitations if I use
> "split" and get a big array(?)  I wondered if there's a way I could
> read (stream?) the string from start to finish and read what's
> delimited by the "3" into a variable, process the smaller string
> variable then append/build a new string with the processed data?
> 
> Would I loop it and read it char by char till a "3"...? Or?

Use the .find() or .index() methods to find the next occurrence of a
character.

Building a large string by concatenation is inefficient, as each append
will copy the original string. If you must have the result as a
single string, using cStringIO would be preferable. But you'd be better
off if you can work with a list of strings.

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Processing a large string goldtech <goldtech@worldpost.com> - 2011-08-11 19:03 -0700
  Re: Processing a large string MRAB <python@mrabarnett.plus.com> - 2011-08-12 03:15 +0100
  Re: Processing a large string Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-12 12:30 +1000
  Re: Processing a large string Nobody <nobody@nowhere.com> - 2011-08-12 05:11 +0100
  Re: Processing a large string Peter Otten <__peter__@web.de> - 2011-08-12 10:39 +0200
    Re: Processing a large string goldtech <goldtech@worldpost.com> - 2011-08-12 06:36 -0700
    Re: Processing a large string Peter Otten <__peter__@web.de> - 2011-08-12 16:48 +0200
  Re: Processing a large string Paul Rudin <paul.nospam@rudin.co.uk> - 2011-08-28 20:18 +0100

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