string.find does not work in file

[Wolfram Strauß]

Hi,
I have a problem to run the following lines in a file.
>
import string
f = open('in.txt')
for l in f.readlines():
	print string.find(l, '"\n')
<

In my python shell (version 2.2.2) on a W2000 system the code finds all 
lines with the pattern. But running the same code as a python scipt in a 
shell it does not find any pattern.

If you have any idea, please let me know. Thanks Wolfram

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