simple_grep.py

#!/usr/bin/python
# Simple grep
# usage: simple_grep.py <regex> <filename>

import sys
import re

if __name__ == "__main__":
    try:
        regex = sys.argv[1]
        filename = sys.argv[2]
        with open(filename) as f:
            cont = f.read()
    except IndexError:
        print('usage: simple_grep.py <regex> <filename>')
    except FileNotFoundError:
        print('Cannot open file %s'%filename)
    except UnicodeDecodeError:
        print('Is this file a binary file?')
    else:
        lines = cont.split('\n')
        rex = re.compile(regex)
        for i in lines:
            if rex.search(i):
                print(i)