Mimic nix grep with Python3

grep.py

import re
import argparse

parser = argparse.ArgumentParser(description='Mimic Linux grep command for Python')
parser.add_argument('pattern', type=str, help='The pattern to search for')
parser.add_argument('file', type=str, help='The file to search in')
parser.add_argument('-i', '--ignore-case', action='store_true', help='Perform case-insensitive search')

args = parser.parse_args()

if args.ignore_case:
    pattern = re.compile(args.pattern, re.IGNORECASE)
else:
    pattern = re.compile(args.pattern)

with open(args.file) as f:
    for line in f:
        if pattern.search(line):
            print(line.rstrip())