Simple grep with Python

grep.py

#!/usr/bin/env python
"""Usage: grep.py regexp file"""

import re, sys

if len(sys.argv) < 3:
    print(__doc__)
    exit(1)

regexp = re.compile(sys.argv[1]);

with open(sys.argv[2], 'rb') as file:
    for line in file:
        match = re.match(regexp, line)
        if match:
            sys.stdout.write(line)

egrep;)