在 python 中并行运行多个函数

Question

Ok so, I searched for this answer all over the inte.net but I am getting the answers which just run these functions one after the other

import time

def a():
    time.sleep(5)
    print("lmao")
def b():
    time.sleep(5)
    print("not so lmao huh")

I want "lmao" and "not so lmao" to be printed at the same time ( after 5 seconds) The solutions which I saw all over the inte.net just printed "lmao" after 5 seconds of starting the program and "not so lmao huh" after 5 seconds of a()

Answer 1

As Far as i understood your question you should use threading for it. you can refer this guideThreading . If you need any clarification feel free to comment.

import thread
import time

# Define a function for the thread
def print_time( threadName, delay):
   count = 0
   while count < 5:
      time.sleep(delay)
      count += 1
      print "%s: %s" % ( threadName, time.ctime(time.time()) )

# Create two threads as follows
try:
   thread.start_new_thread( print_time, ("Thread-1", 2, ) )
   thread.start_new_thread( print_time, ("Thread-2", 4, ) )
except:
   print "Error: unable to start thread"

while 1:
   pass

Answer 2

If you want to run your functions parallel, then you may want to use the multiprocessing .

You can create some processes and execute your function in them.

For example:

import time
import multiprocessing as mp
from multiprocessing.context import Process


def a():
    time.sleep(5)
    print("lmao")


def b():
    time.sleep(5)
    print("not so lmao huh")

if __name__ == '__main__':
    p1: Process = mp.Process(target=a)
    p2: Process = mp.Process(target=b)
    p1.start()
    p2.start()
    p1.join()
    p2.join()

There are also such API for coroutines and tasks and threading . Maybe you will find them more convenient.