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 email addresses that I want to search in the data file(also contains email addresses). Then I want to print the output to a file or display on the console. I search for scripts and was able to modify but I'm not getting the desired results. Can you please help me?

dfile1 (50K lines)
[email protected]
[email protected]
[email protected]


ifile1 (10K lines)
[email protected]
[email protected]
[email protected]
[email protected]

Output file
[email protected]
[email protected]



datafile = 'C:\\Python27\\scripts\\dfile1.txt'
inputfile = 'C:\\Python27\\scripts\\ifile1.txt'

with open(inputfile, 'r') as f:
names = f.readlines()

outputlist = []

with open(datafile, 'r') as fd:
  for line in fd:
    name = fd.readline()
    if name[1:-1] in names:
        outputlist.append(line)
    else:
        print "Nothing found"
 print outputlist

New Code

with open(inputfile, 'r') as f:
    names = f.readlines()
outputlist = []

with open(datafile, 'r') as f:
    for line in f:
        name = f.readlines()
        if name in names:
            outputlist.append(line)
        else:
            print "Nothing found"
    print outputlist

Answer 1

Maybe I'm missing something, but why not use a pair of sets?

#!/usr/local/cpython-3.3/bin/python

data_filename = 'dfile1.txt'
input_filename = 'ifile1.txt'

with open(input_filename, 'r') as input_file:
    input_addresses = set(email_address.rstrip() for email_address in input_file.readlines())

with open(data_filename, 'r') as data_file:
    data_addresses = set(email_address.rstrip() for email_address in data_file.readlines())

print(input_addresses.intersection(data_addresses))