Python:同时执行多个函数 [英] Python: Executing multiple functions simultaneously
问题描述
我正在尝试在 Python 中同时运行两个函数.我已经尝试了以下使用 multiprocessing
的代码,但是当我执行代码时,第二个函数仅在第一个函数完成后才启动.
I'm trying to run two functions simultaneously in Python. I have tried the below code which uses multiprocessing
but when I execute the code, the second function starts only after the first is done.
from multiprocessing import Process
def func1:
#does something
def func2:
#does something
if __name__=='__main__':
p1 = Process(target = func1)
p1.start()
p2 = Process(target = func2)
p2.start()
推荐答案
您做得对.:)
尝试运行这段愚蠢的代码:
Try running this silly piece of code:
from multiprocessing import Process
import sys
rocket = 0
def func1():
global rocket
print 'start func1'
while rocket < sys.maxint:
rocket += 1
print 'end func1'
def func2():
global rocket
print 'start func2'
while rocket < sys.maxint:
rocket += 1
print 'end func2'
if __name__=='__main__':
p1 = Process(target = func1)
p1.start()
p2 = Process(target = func2)
p2.start()
您将看到它打印start func1",然后打印start func2",然后经过(非常)很长时间后,您将最终看到函数结束.但它们确实会同时执行.
You will see it print 'start func1' and then 'start func2' and then after a (very) long time you will finally see the functions end. But they will indeed execute simultaneously.
因为进程需要一段时间才能启动,您甚至可能会看到'start func2' before 'start func1'.
Because processes take a while to start up, you may even see 'start func2' before 'start func1'.
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