Python3中时间处理与定时任务的方法介绍（附代码）

#! /usr/bin/env python#coding=utf-8# 获取今天、昨天和明天的日期# 引入datetime模块import datetime #计算今天的时间today = datetime.date.today()#计算昨天的时间 yesterday = today - datetime.timedelta(days = 1)#计算明天的时间tomorrow = today + datetime.timedelta(days = 1) #打印这三个时间print(yesterday, today, tomorrow)

#! /usr/bin/env python#coding=utf-8# 计算上一个的时间#引入datetime,calendar两个模块import datetime,calendar  last_friday = datetime.date.today() oneday = datetime.timedelta(days = 1)     while last_friday.weekday() != calendar.FRIDAY:     last_friday -= oneday     print(last_friday.strftime('%A, %d-%b-%Y'))

#! /usr/bin/env python#coding=utf-8# 借助模运算，可以一次算出需要减去的天数，计算上一个星期五#同样引入datetime,calendar两个模块import datetime import calendar     today = datetime.date.today() target_day = calendar.FRIDAY this_day = today.weekday() delta_to_target = (this_day - target_day) % 7last_friday = today - datetime.timedelta(days = delta_to_target)     print(last_friday.strftime("%d-%b-%Y"))

#! /usr/bin/env python#coding=utf-8# 获取一个列表中的所有歌曲的播放时间之和 import datetime     def total_timer(times):     td = datetime.timedelta(0)     duration = sum([datetime.timedelta(minutes = m, seconds = s) for m, s in times], td)     return duration     times1 = [(2, 36),           (3, 35),           (3, 45),           ] times2 = [(3, 0),           (5, 13),           (4, 12),           (1, 10),           ]     assert total_timer(times1) == datetime.timedelta(0, 596) assert total_timer(times2) == datetime.timedelta(0, 815)     print("Tests passed."      "First test total: %s"      "Second test total: %s" % (total_timer(times1), total_timer(times2)))

#! /usr/bin/env python#coding=utf-8# 以需要的时间间隔执行某个命令     import time, os     def re_exe(cmd, inc = 60):     while True:         os.system(cmd);         time.sleep(inc)     re_exe("echo %time%", 5)

#! /usr/bin/env python#coding=utf-8#这里需要引入三个模块import time, os, sched # 第一个参数确定任务的时间，返回从某个特定的时间到现在经历的秒数 # 第二个参数以某种人为的方式衡量时间 schedule = sched.scheduler(time.time, time.sleep) def perform_command(cmd, inc):     os.system(cmd) def timming_exe(cmd, inc = 60):     # enter用来安排某事件的发生时间，从现在起第n秒开始启动     schedule.enter(inc, 0, perform_command, (cmd, inc))     # 持续运行，直到计划时间队列变成空为止     schedule.run()  print("show time after 10 seconds:") timming_exe("echo %time%", 10)

#! /usr/bin/env python#coding=utf-8import time, os, sched # 第一个参数确定任务的时间，返回从某个特定的时间到现在经历的秒数 # 第二个参数以某种人为的方式衡量时间 schedule = sched.scheduler(time.time, time.sleep)   def perform_command(cmd, inc):     # 安排inc秒后再次运行自己，即周期运行     schedule.enter(inc, 0, perform_command, (cmd, inc))     os.system(cmd)                         def timming_exe(cmd, inc = 60):     # enter用来安排某事件的发生时间，从现在起第n秒开始启动     schedule.enter(inc, 0, perform_command, (cmd, inc))     # 持续运行，直到计划时间队列变成空为止     schedule.run() print("show time after 10 seconds:") timming_exe("echo %time%", 10)