On Jun 17, 10:46 pm, Hrvoje Niksic <[EMAIL PROTECTED]> wrote:
> Patrick David <[EMAIL PROTECTED]> writes:
> > I am searching for a way to jump to a specific line in a text file,
> > let's say to line no. 9000. Is there any method like file.seek()
> > which leads me to a given line instead of a given byte?
>
> You can simulate it fairly easily, but it will internally read the
> file line by line and will take the time roughly proportional to the
> size of the file.
>
> from itertools import islice
> def seek_to_line(f, n):
The OP gave no impression that he'd restrict himself to one
seek_to_line call per open. Perhaps you need
f.seek(0)
here otherwise
seek_to_line(f, 20)
seek_to_line(f, 10)
will give something unexpected (like jumping forwards instead of
backwards).
> for ignored_line in islice(f, n - 1):
> pass # skip n-1 lines
>
> f = open('foo')
> seek_to_line(f, 9000) # seek to line 9000
>
> # print lines 9000 and later
> for line in f:
> print line
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