This works because by doing: from time import sleep To just make it wait for a second: from time import sleep We can also use it directly in a loop: import randomĪnd running it we might see: now 1400102751.46Īs we see, this buzzer is not too rigid and allow us to catch up with regular sleepy intervals even if we oversleep and get out of regular schedule.ĭelays are done with the time library, specifically the time.sleep() function. Time.sleep(5) # Sleeping a bit longer than usually Invoking regular buzzergen from sleepy import buzzergenīuzzer = buzzergen(3) # Planning to wake up each 3 seconds
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The following code ( sleepy.py) defines a buzzergen generator: import time The situation can be, we want to do something as regularly as possible and we do not want to bother with all the last_time, next_time stuff all around our code. Here is one possible solution: Delay measured since last time (waking up regularly)
It can be fixed time, but in some cases we might need a delay measured since last time. Root.after(5000, ohhi) # Milliseconds and then a functionįinally, the asyncio.sleep() method (has to be in an async loop): await asyncio.sleep(5)
after() method (best with Tkinter): import tkinter as tk # Tkinter for Python 2 Matplotlib's function pyplot.pause() example (not recommended if you are not using the graph, but you could exit the graph instantly): import matplotlib # If you are going to use the time module () example (not recommended if you are not using the pygame window, but you could exit the window instantly): import pygame Time.sleep() example (do not use if using tkinter): import time There are five methods which I know: time.sleep(), (), matplotlib's pyplot.pause(). A sub-thread makes a lot more sense for a simple timer than a whole new subprocess. You can create one, but it probably doesn't exist for a reason. There isn't a respective object in the multiprocessing library. The upside of this method is that while the Timer thread was waiting, I was able to do other things, in this case, hitting Enter one time - before the function executed (see the first empty prompt). The blank line illustrates that the function printed to my standard output, and I had to hit Enter to ensure I was on a prompt. > t = Timer(3, party_time, args=None, kwargs=None) You can trigger a function to be called at a later time in a separate thread with the Timer threading object: > from threading import Timer Print('total time to execute four 3-sec functions:', end_time - start_time)Įxample output from this script: thread1 party time!: _main_ Proc_future1, proc_future2, thread_future1, thread_future2,]): Thread_future2 = thread_executor.submit(party_later, kind='thread', n='2') Thread_future1 = thread_executor.submit(party_later, kind='thread', n='1') Proc_future2 = proc_executor.submit(party_later, kind='proc', n='2') Proc_future1 = proc_executor.submit(party_later, kind='proc', n='1') With ThreadPoolExecutor() as thread_executor: With ProcessPoolExecutor() as proc_executor: Return kind + n + ' party time!: ' + _name_
To demonstrate, create a script like this (I first attempted this in an interactive Python 3.5 shell, but sub-processes can't find the party_later function for some reason): from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor, as_completed Example using sleep with multiple threads and processesĪgain, sleep suspends your thread - it uses next to zero processing power.
"hooray!" is printed 3 seconds after I hit Enter. Use it for that purpose, or simply to delay a function from executing. This function actually suspends the processing of the thread in which it is called by the operating system, allowing other threads and processes to execute while it sleeps. In a single thread I suggest the sleep function: > from time import sleep
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