#!/usr/bin/env python 
# Gmail Account Checker   
 
import sys, poplib 
 
def printHelp(): 
    print '\nUsage: ./gmailcheck.py <emaillist>' 
    print 'Example: ./gmailcheck.py emails.txt' 
    print '\nNote: The accounts must be in the following format: user@gmail.com:password\n' 
 
 
print ''' 
\t _____           _ _ 
\t|   __|_____ ___|_| | 
\t|  |  |     | .'| | | 
\t|_____|_|_|_|__,|_|_| 
\t   Account Checker  
''' 
printHelp() 
mailfile = raw_input("ENTER NAME OF FILE WITH ACCOUNTS :")

#Change these if needed
SAVEFILE = 'valid_accounts.txt' 
HOST = 'pop.gmail.com' 
PORT = 995 
 
# Do not change anything below. 
maillist = mailfile
valid = [] 
currline = 0 
 
try: 
    handle = open(maillist) 
except: 
    print '\n[-] Could not open the accounts file. Check the file path and try again.' 
    print '\n[-] Quitting ...' 
    exit(1) 
 
for line in handle: 
    currline += 1 
 
    try: 
        email = line.split(':')[0] 
        password = line.split(':')[1].replace('\n', '') 
    except: 
        print '\n[-] Erroneous account format at line %d.' % currline 
        print '[!] Accounts must be in the following format: user@gmail.com:password' 
        print '\n[-] Quitting ...' 
        exit(1) 
...

for line in open("file.txt","r").readlines():
  if line == "some string":
    # тут надо удалить строку, как это проще всего сделать?