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How to get line count cheaply in Python?
a want to find total lines in a text file using python, an easy solution is to iterate over lines using `open('file.txt') and count them.
can anybody introduce me a better solution?
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4use `wc -l` and not `python` :-) – mgilson Jan 15 '13 at 21:08
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this is part of my application, that must be cross platform. – pylover Jan 15 '13 at 21:09
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1@mgilson `wc -l` might not work in windows. – Ashwini Chaudhary Jan 15 '13 at 21:11
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Good duplicate question - my first choice would be my deleted answer using sum, and my second would have been mmap - oh well - got it all covered on that one :) – Jon Clements Jan 15 '13 at 21:15
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Are you doing this on huge text files and is efficiency a primary concern? – paddy Jan 15 '13 at 21:19
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@JonClements I had the same question earlier today, so it took me no time to search again. :) – Ashwini Chaudhary Jan 15 '13 at 21:45
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@paddy: yes, my problem is textfiles greater that 100GB. – pylover Jan 15 '13 at 21:49
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There's no better way, _unless_ something is known about the file structure (like "all lines are no less than 80 chars long"). – georg Jan 15 '13 at 23:04