Python3中常用的处理时间和实现定时任务的方法的介绍

#! /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./n"  "First test total: %s/n"  "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)