Python search a file for text using input from another file

Question

I\'m new to python and programming. I need some help with a python script. There are two files each containing email addresses (more than 5000 lines). Input file contains em

Answer 1

mitan8 gives the problem you have, but this is what I would do instead:

with open(inputfile, "r") as f:
    names = set(i.strip() for i in f)

output = []

with open(datafile, "r") as f:
    for name in f:
        if name.strip() in names:
            print name

This avoids reading the larger datafile into memory.

If you want to write to an output file, you could do this for the second with statement:

with open(datafile, "r") as i, open(outputfile, "w") as o:
    for name in i:
        if name.strip() in names:
            o.write(name)