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#!/bin/python

"""
A grep implementation on Python
"""

from re import search
from sys import argv


def grep(word, file):
    for line in file:
        if search(word, line):
            print(line.strip())


if __name__ == "__main__":
    try:
        grep(argv[1], open(argv[2]))
    except FileNotFoundError:
        print("That's not a vaild file.")
    except IndexError:
        print("Params missing!")

def grep(word, file):
    for line in file:
        if word in line:
            print(line.strip())