Based on computer clock, at each hour of 5 minutes, 10 minutes, 15 minutes,,,,,,, 45 minutes and 50 minutes, 55, minutes, 00 minute began to run the program,

For example:
# 00:00
Print (" hello ")
# 00:05
Print (" hello ")
# 00:10
Print (" hello ")
# 00:15
Print (" hello ")
# 00:20
Print (" hello ")
*
*
*
*
# 00:50
Print (" hello ")
# 00:55
Print (" hello ")
# 01:00
Print (" hello ")



Permanent cycle

CodePudding user response:

With a datetime

 import datetime 
Instant=1 # this variable is used to ensure that print only once in a interval 
While True: 
Now=datetime. Datetime. Now () 
If now. The 5 minute %==0 and now the minute!=instant: 
Instant=now. Minute 
Print (" Hello, world ") 

CodePudding user response:

CPU usage is too high

CodePudding user response:

The from threading import Timer

A timer, a minute time

Perfect, and then open two timers, the first is to calculate the next time (0,5,10) time difference, to start a second timer, the second is the work, set to 5 minutes (300 seconds),

CodePudding user response:

refer to the second floor lwq2677 response:

CPU use too much

That is:
1. Add a time. Sleep (), to test, but the cycle time very naive

 import datetime, time 
Instant=1 
Now=datetime. Datetime. Now () 
Time. Sleep (300 - (now. Minute % 5) * 60 - now in the second - 1) 
While True: 
Now=datetime. Datetime. Now () 
If now. The 5 minute %==0 and now the minute!=instant: 
Instant=now. Minute 
Print (now the hour, ":", now the minute, ":", now the second) 
Print (" Hello, world ") 
Time. Sleep (299) 

2. Such as the upstairs said, opening a thread, timer timing, no cycle

 import threading, datetime 
Def doItRepeatly () : 
DoItRepeatly, threading. The Timer (300) start () 
Print (" Hello world ") 

Now=datetime. Datetime. Now () 
First=300 - (now. Minute % 5) * 60 - now the second # for the first point 
DoItRepeatly, threading. The Timer (first) start () 

This you need to monitor: 1. The number of threads, GC should automatically recycling abandoned old threads,
2. The heap usage, their test