# -*- coding: utf-8 -*-
"""
Created on Sat Jul 28 18:17:22 2018

@author: hashimoto
"""

import time

start_time
end_time

def time_start():
    start_time = time.time()

def time_end():
    end_time = time.time()
    
print(str(time_start()))
print(str(time_end()))

print(end_time - start_time)
