Question

i am trying to grab some lines form lines in a huge file. For example suppose
f =

a b
c d
e s
m n
h g
.
.
.

The code I am trying to used is as follows

import re
f = open('f.txt')
y = [a,s, ...] # the laters that i would like to grab it with the line form the file f
grab = y
for line in f:
    match = grab.search(line)
    if match: 
        print match.group()

Answer 1

With the following code you will print lines from f if any of the chars in y is in the line.
You can modify it easily if what you want is to get lines where both chars are in y

for line in f:
    letters = line.split()
    for letter in letters:
       if letter in y:
           print line
           break

btw, do not forget to close your open file or better to use with as .