actually unique uniq implemented in python

uniq_uniq.py

import sys
import argparse
import collections

parser = argparse.ArgumentParser()
parser.add_argument('-c', action='store_const', const=True, required=False)
args = parser.parse_args()

lines = sys.stdin.readlines()
counter = collections.Counter(lines)
for line in set(lines):
	if args.c == True:
		line = str(counter[line]) + " " + line
	sys.stdout.write(line)