在Python中使用os.system（）并行运行两个可执行文件？

Question

我希望并行运行两个可执行文件a.exe和b.exe，一个接一个地调用。

当我想，

os.system('a.exe') 
#some code 
os.system('b.exe') 

B.EXE是起步后，才杀了a.exe的？ 为什么会发生？ 我怎样才能同时运行两个？ （我需要做的多线程？） 注：我在Windows平台

Answer 1

尝试运行每一个作为一个单独的线程：

import thread 

thread.start_new_thread(os.system, ('a.exe',)) 
thread.start_new_thread(os.system, ('b.exe',)) 

Answer 2

你可能想尝试subprocess.Popen，这允许进程执行但不会阻止。但是在这个例子中你必须考虑僵尸进程。

Answer 3

您可以使用特定的方式来运行两个或多个命令或programms的，如线程库的Python。这里有一个关于它如何工作的广泛例子。

import threading 
import time 

exitFlag = 0 

class myThread (threading.Thread): 
    def __init__(self, threadID, name, counter): 
     threading.Thread.__init__(self) 
     self.threadID = threadID 
     self.name = name 
     self.counter = counter 
    def run(self): 
     print "Starting " + self.name 
     print_time(self.name, self.counter, 5) 
     print "Exiting " + self.name 

def print_time(threadName, delay, counter): 
    while counter: 
     if exitFlag: 
      threadName.exit() 
     time.sleep(delay) 
     print "%s: %s" % (threadName, time.ctime(time.time())) 
     counter -= 1 

# Create new threads 
thread1 = myThread(1, "Thread-1", 1) 
thread2 = myThread(2, "Thread-2", 2) 

# Start new Threads 
thread1.start() 
thread2.start() 

print "Exiting Main Thread" 

然后，你的代码可能是这样的：

import threading 


class myThread (threading.Thread): 
    def __init__(self, command): 
     threading.Thread.__init__(self) 
     self.cmd = command 

    def run(self): 
     print "Starting " + self.cmd 
     os.system(self.cmd) 
     print "Exiting " + self.cmd 

lstCmd=["a.exe","b.exe","ping 192.168.0.10","some command"] 

# Create new threads 
thread1 = myThread(lstCmd[0]) 
thread2 = myThread(lstCmd[1]) 
thread3 = myThread(lstCmd[2]) 
thread4 = myThread(lstCmd[3]) 

# Start new Threads 
thread1.start() 
thread2.start() 
thread3.start() 
thread4.start() 

Answer 4

如果我们忽略例外那么简单，同时运行几个程序：

#!/usr/bin/env python 
import subprocess 

# start all programs 
processes = [subprocess.Popen(program) for program in ['a', 'b']] 
# wait 
for process in processes: 
    process.wait() 

见Python threading multiple bash subprocesses?

如果你想停止以前启动的进程，如果任何程序失败ls开始：

#!/usr/bin/env python3 
from contextlib import ExitStack 
from subprocess import Popen 


def kill(process): 
    if process.poll() is None: # still running 
     process.kill() 

with ExitStack() as stack: # to clean up properly in case of exceptions 
    processes = [] 
    for program in ['a', 'b']: 
     processes.append(stack.enter_context(Popen(program))) # start program 
     stack.callback(kill, processes[-1]) 
    for process in processes: 
     process.wait()