Python3, python

Python3, python
1. Calculate the date of tomorrow and yesterday

#! /Usr/bin/env python # coding = UTF-8 # Get the date of today, yesterday, and tomorrow # introduce the datetime module import datetime # Calculate today's time today = datetime. date. today () # Calculate yesterday's time yesterday = today-datetime. timedelta (days = 1) # Calculate tomorrow's time tomorrow = today + datetime. timedelta (days = 1) # print the three time prints (yesterday, today, tomorrow)

2. Calculate the last time

Method 1:

#! /Usr/bin/env python # coding = UTF-8 # Calculate the previous time # introduce datetime and calendar modules import datetime and 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 '))

Method 2: Use the modulo operation to find the last Friday

#! /Usr/bin/env python # coding = UTF-8 # With the help of the modulo operation, you can calculate the number of days to be subtracted at a time, and calculate the number of days to be subtracted from the previous Friday # datetime is also introduced, the two calendar modules 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 "))

3. Calculate the total playback time of a song.

#! /Usr/bin/env python # coding = UTF-8 # Get the sum of playing time of all songs in a list 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. Execute a command repeatedly

#! /Usr/bin/env python # coding = UTF-8 # execute a command import time, OS def re_exe (cmd, inc = 60) at the required time interval: while True: OS. system (cmd); time. sleep (inc) re_exe ("echo % time %", 5)

5. scheduled tasks

#! /Usr/bin/env python # coding = UTF-8 # Here we need to introduce three modules import time, OS, sched # The first parameter to determine the task time, returns the number of seconds that have elapsed since a specific time # The second parameter measures the time schedule = sched in a certain way. scheduler (time. time, time. sleep) def into m_command (cmd, inc): OS. system (cmd) def timming_exe (cmd, inc = 60): # enter is used to schedule the occurrence time of an event. From now on, start schedule in the nth second. enter (inc, 0, cmdm_command, (cmd, inc) # run continuously until the scheduled time queue becomes empty. run () print ("show time after 10 seconds:") timming_exe ("echo % time %", 10)

6. Implement periodic call using sched

#! /Usr/bin/env python # coding = utf-8import time, OS, sched # The first parameter determines the task time, returns the number of seconds that have elapsed since a specific time # The second parameter measures the time schedule = sched in a certain way. scheduler (time. time, time. sleep) def into m_command (cmd, inc): # schedule inc seconds and run schedule again. enter (inc, 0, cmdm_command, (cmd, inc) OS. system (cmd) def timming_exe (cmd, inc = 60): # enter is used to schedule the occurrence time of an event. From now on, start schedule in the nth second. enter (inc, 0, cmdm_command, (cmd, inc) # run continuously until the scheduled time queue becomes empty. run () print ("show time after 10 seconds:") timming_exe ("echo % time %", 10)