#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import time

a = []
t0 = time.clock()
for i in range(1,20000):
	a.append(i)
print(time.clock() - t0, "seconds process time")
print(a)
t0 = time.clock()
b = [i for i in range(1,20000)]
print(time.clock() - t0, "seconds process time")
print(b)