python split

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import time

    num = 1
    f = file('/etc/passwd','r')
    for i in content:
        c = i.strip()
        split = c.split(':')
        print num,split[0]
        time.sleep(0.1)
        num = num + 1
    f.close
if __name__ == '__main__':
    print content