1.計(jì)算明天和昨天的日期

#! /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(jì)算今天的時(shí)間

today = datetime.date.today()

#計(jì)算昨天的時(shí)間

yesterday = today - datetime.timedelta(days = 1)

#計(jì)算明天的時(shí)間

tomorrow = today + datetime.timedelta(days = 1)

#打印這三個(gè)時(shí)間

print(yesterday, today, tomorrow)

2.計(jì)算上一個(gè)的時(shí)間

方法1:

#! /usr/bin/env python

#coding=utf-8

# 計(jì)算上一個(gè)的時(shí)間

#引入datetime,calendar兩個(gè)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'))

方法二：借助模運(yùn)算尋找上一個(gè)星期五

#! /usr/bin/env python

#coding=utf-8

# 借助模運(yùn)算，可以一次算出需要減去的天數(shù)，計(jì)算上一個(gè)星期五

#同樣引入datetime,calendar兩個(gè)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) % 7

last_friday = today - datetime.timedelta(days = delta_to_target)

print(last_friday.strftime("%d-%b-%Y"))

3.計(jì)算歌曲的總播放時(shí)間

#! /usr/bin/env python

#coding=utf-8

# 獲取一個(gè)列表中的所有歌曲的播放時(shí)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)))

4.反復(fù)執(zhí)行某個(gè)命令

#! /usr/bin/env python

#coding=utf-8

# 以需要的時(shí)間間隔執(zhí)行某個(gè)命令

import time, os

def re_exe(cmd, inc = 60):

while True:

os.system(cmd);

time.sleep(inc)

re_exe("echo %time%", 5)

5.定時(shí)任務(wù)

#! /usr/bin/env python

#coding=utf-8

#這里需要引入三個(gè)模塊

import time, os, sched

# 第一個(gè)參數(shù)確定任務(wù)的時(shí)間，返回從某個(gè)特定的時(shí)間到現(xiàn)在經(jīng)歷的秒數(shù)

# 第二個(gè)參數(shù)以某種人為的方式衡量時(shí)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(lái)安排某事件的發(fā)生時(shí)間，從現(xiàn)在起第n秒開(kāi)始啟動(dòng)

schedule.enter(inc, 0, perform_command, (cmd, inc))

# 持續(xù)運(yùn)行，直到計(jì)劃時(shí)間隊(duì)列變成空為止

schedule.run()

print("show time after 10 seconds:")

timming_exe("echo %time%", 10)

6.利用sched實(shí)現(xiàn)周期調(diào)用

#! /usr/bin/env python

#coding=utf-8

import time, os, sched

# 第一個(gè)參數(shù)確定任務(wù)的時(shí)間，返回從某個(gè)特定的時(shí)間到現(xiàn)在經(jīng)歷的秒數(shù)

# 第二個(gè)參數(shù)以某種人為的方式衡量時(shí)間

schedule = sched.scheduler(time.time, time.sleep)

def perform_command(cmd, inc):

# 安排inc秒后再次運(yùn)行自己，即周期運(yùn)行

schedule.enter(inc, 0, perform_command, (cmd, inc))

os.system(cmd)

def timming_exe(cmd, inc = 60):

# enter用來(lái)安排某事件的發(fā)生時(shí)間，從現(xiàn)在起第n秒開(kāi)始啟動(dòng)

schedule.enter(inc, 0, perform_command, (cmd, inc))

# 持續(xù)運(yùn)行，直到計(jì)劃時(shí)間隊(duì)列變成空為止

schedule.run()

print("show time after 10 seconds:")

timming_exe("echo %time%", 10)

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