[Tutor] Searching in a file

[Emile van Sebille]

On 1/13/2010 9:49 AM Paul Melvin said...
> Hi,
>
> I have a file generated from a webpage.
>
> I want to search that file for a specific keyword, in my case 'NEW'.
>
> Once I have found that keyword I want to retrieve information below it, e.g.
> web link, size of file etc.
>
> When I have this information I move off until I find another 'NEW' and the
> process starts all over.
>
> Please can someone give me some pointers on how to do this.
>
> I can find the line containing 'NEW' which I get using a simple for loop on
> every line in the file, but how do I then traverse the next x amount of
> lines, taking what I want until either the next 'NEW' or eof.
>
> e.g.
>
> for line in file:
> 	if re.findall('NEW', line)	# or search
> 		list.append(line)		# to do something to later
<don't use list as i shadows the builtin list>

>
> I cannot 'get' to the following lines because I would need to get out of the
> loop.

How about (untested):

additionalLines = 3
remainingLines = 0

for line in file:
   if 'NEW' in line or remainingLines:
     mylist.append(line)
     if not remainingLines:
       remainingLines = additionalLines
     else:
       remainingLines -= 1

Emile

>
> I did use enumerate and was wondering if I could use the line number, or
> maybe I could use an re iterator.
>
> Any advice would be much appreciated.
>
> Thanks
>
> paul
>
>
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