parsing - Python parse only specific parts of text file -

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i have text file containing lots of data looks this:

logstart . . . (chunk of data) logend . . . logstart . . . (chunk of data) logend . . . times logstart . . . (chunk of data) logend . . . times logstart . . . (chunk of data) logend . . .

i want python code open file , read chunks of data if , if there "times" associated right below "logend". if there no times chunk want ignore it. , when reads correct chunks of data want read times associated it.

this had before realized needed extract parts (which saved entire text file 'lines'):

lines = [] open(filename, 'rt') in_file:     line in in_file:         lines.append(line)

how can change 'lines' specific parts of file?

something this:

lines = [] open(filename, 'rt') in_file:     chunk = []     line in in_file:         chunk.append(line)         if(line.find('times')>=0):             lines.extend(chunk)         if(line.find('logstart')>=0):             chunk = []




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