Python3优雅操作-时间处理与定时任务

#! /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) % 7
last_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-8
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): 
    # 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)