>> I have to search for a string on a big file. Once this string
>> is found, I would need to get the number of the line in which
>> the string is located on the file. Do you know how if this is
>> possible to do in python ?
>
> This should be reasonable:
>
>>>> for num, line in enumerate(open("/python25/readme.txt")):
> if "Guido" in line:
> print "Found Guido on line", num
> break
>
>
> Found Guido on line 1296
Just a small caveat here: enumerate() is zero-based, so you may
actually want add one to the resulting number:
s = "Guido"
for num, line in enumerate(open("file.txt")):
if s in line:
print "Found %s on line %i" % (s, num + 1)
break # optionally stop looking
Or one could use a tool made for the job:
grep -n Guido file.txt
or if you only want the first match:
sed -n '/Guido/{=;p;q}' file.txt
-tkc
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