#!/usr/bin/python3 -u
# coding=utf-8

import subprocess, sys

pipe = subprocess.Popen(['apt-get', 'download', 'firefox'], 0, stderr = subprocess.STDOUT, stdout = subprocess.PIPE)
while True:
	content = pipe.stdout.read(1).decode()
	if content == '':
		break
	sys.stdout.write(content)
pipe.wait()