Python time

#time模块
import time

#print(time.time())  #1518082617.222511   *****
# 该数值为1970年unix诞生到现在的秒数  为时间戳
#time.sleep(3)        #后边程序在3秒后执行  *****
#print(time.clock())   #计算cpu执行时间
#print(time.gmtime())  #结构化时间：time.struct_time(tm_year=2018, tm_mon=2, tm_mday=8,
#  tm_hour=9, tm_min=44, tm_sec=19, tm_wday=3, tm_yday=39, tm_isdst=0)
#print(time.localtime()) #结构化时间（北京）：time.struct_time(tm_year=2018, tm_mon=2, tm_mday=8,
# tm_hour=17, tm_min=55, tm_sec=9, tm_wday=3, tm_yday=39, tm_isdst=0)
#print(help(time))
#struct_time = time.localtime()
#print(time.strftime('%Y--%m--%d %H:%M:%S',struct_time))  #2018--02--08 18:05:21 *****
# print(time.strptime('2018--02--08 18:05:21','%Y--%m--%d %H:%M:%S'))
# a = time.strptime('2018--02--08 18:05:21','%Y--%m--%d %H:%M:%S')
# print(a.tm_year)  #2018
# print(a.tm_hour)  #18


#时间戳，结构化时间，格式化时间
#print(time.ctime())  # Thu Feb  8 21:39:35 2018
#print(time.ctime(3600))  # Thu Jan  1 09:00:00 1970
#print(time.mktime(time.localtime()))  # 1518097484.0

import datetime

print(datetime.datetime.now())  #2018-02-09 07:35:47.956193

#时间
%Y  Year with century as a decimal number.
%m  Month as a decimal number [01,12].
%d  Day of the month as a decimal number [01,31].
%H  Hour (24-hour clock) as a decimal number [00,23].
%M  Minute as a decimal number [00,59].
%S  Second as a decimal number [00,61].
%z  Time zone offset from UTC.
%a  Locale's abbreviated weekday name.
%A  Locale's full weekday name.
%b  Locale's abbreviated month name.
%B  Locale's full month name.
%c  Locale's appropriate date and time representation.
%I  Hour (12-hour clock) as a decimal number [01,12].
%p  Locale's equivalent of either AM or PM.