Python如何获取当前时间，格式如下：

# -*- coding:UTF-8 -*-
import time
print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
time.sleep(1)
print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))

import time
time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))

import time
t = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
print ("%s"%t)

from time import clock
start_time = clock()
end_time = clock()