Yuck. Talk about a one shot function! Of course it only reads through the
file once! You only call the function once. Put a second print randline(f)
at the bottom of your script and see what happens :-)
JS
> This method only keeps one line in memory, only reads through the file
> once, and does not favor lines based on any characteristic of the line.
> It's probably fast enough to not even bother keeping an index around:
>
> #!/bin/env python
>
> import os
> import random
>
> text = 'shaks12.txt'
> if not os.path.exists(text):
> os.system('wget http://www.gutenberg.org/dirs/etext94/shaks12.txt')
>
> f = file(text, 'rb')
>
> def randline(f):
> for i,j in enumerate(f):
> if random.randint(0,i) == i:
> line = j
> return line
>
> print randline(f)
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