how to count lines in a file ?

[William Park]

Shagshag13 <shagshag13 at yahoo.fr> wrote:
> hello,
> 
> i need to count lines in a file (that i *can't* keep in memory, so can't use readlines())
> by now i use this :
> ---
> import os
> 
> BUFFER_SIZE = 10000
> 
> def lineCount(filename, bufferSize = BUFFER_SIZE):
> 
> do = 'wc ' + filename
> p = os.popen(do, 'r')
> line = p.read()
> p.close()
> 
> if line:
>  return long(line.strip().split()[0])
> else:
>  lineCount = 0
>  fhi = file(filename)
>  while 1:
>   lines = fhi.readlines(bufferSize)
>   if not lines:
>      break
> 
>   lineCount += len(lines)
>  return lineCount
> ---
> is it the correct ? do you think i can tweak it ?
> 
> thanks in advance,
> 
> s13.

If you are on Unix, then just use
    wc -l filename
with any of function in 'os' module.

-- 
William Park, Open Geometry Consulting, <opengeometry at yahoo.ca>
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