python中time.time()和 time.strftime()：

time.time()返回的是一个浮点数，以秒为单位，time.strftime后可以自定义格式，如time.strftime('%Y-%m-%d %H:%M:%S')

vi a1.py

#!/usr/bin/python

import time

t1 = time.time()

print t1

t2 = time.strftime('%Y-%m-%d %H:%M:%S')

print t2:wq

python a1.py

今天、昨天、上月、去年：

vi a2.py

#!/usr/bin/python

import time

today = time.strftime('%Y-%m-%d')yesterday = time.localtime()[2]-1last_month = time.localtime()[1]-1last_year = time.localtime()[0]-1print todayprint yesterdayprint last_monthprint last_year:wq

python a2.py