#! /usr/bin/env python#coding=utf-8# 獲取今天、昨天和明天的日期# 引入datetime模塊import datetime #計算今天的時間today = datetime.date.today()#計算昨天的時間 yesterday = today - datetime.timedelta(days = 1)#計算明天的時間tomorrow = today + datetime.timedelta(days = 1) #打印這三個時間print(yesterday, today, tomorrow)

#! /usr/bin/env python#coding=utf-8# 計算上一個的時間#引入datetime,calendar兩個模塊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# 借助模運算，可以一次算出需要減去的天數，計算上一個星期五#同樣引入datetime,calendar兩個模塊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# 獲取一個列表中的所有歌曲的播放時間之和 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# 以需要的時間間隔執行某個命令  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#這里需要引入三個模塊import time, os, sched  # 第一個參數確定任務的時間，返回從某個特定的時間到現在經歷的秒數 # 第二個參數以某種人為的方式衡量時間 schedule = sched.scheduler(time.time, time.sleep)  def perform_command(cmd, inc):  os.system(cmd)   def timming_exe(cmd, inc = 60):  # enter用來安排某事件的發生時間，從現在起第n秒開始啟動  schedule.enter(inc, 0, perform_command, (cmd, inc))  # 持續運行，直到計劃時間隊列變成空為止  schedule.run()    print("show time after 10 seconds:") timming_exe("echo %time%", 10)

#! /usr/bin/env python#coding=utf-8import time, os, sched  # 第一個參數確定任務的時間，返回從某個特定的時間到現在經歷的秒數 # 第二個參數以某種人為的方式衡量時間 schedule = sched.scheduler(time.time, time.sleep)  def perform_command(cmd, inc):  # 安排inc秒后再次運行自己，即周期運行  schedule.enter(inc, 0, perform_command, (cmd, inc))  os.system(cmd)   def timming_exe(cmd, inc = 60):  # enter用來安排某事件的發生時間，從現在起第n秒開始啟動  schedule.enter(inc, 0, perform_command, (cmd, inc))  # 持續運行，直到計劃時間隊列變成空為止  schedule.run()    print("show time after 10 seconds:") timming_exe("echo %time%", 10)