在Python中使用os.system（）並行運行兩個可執行文件？

Question

我希望並行運行兩個可執行文件a.exe和b.exe，一個接一個地調用。

當我想，

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

B.EXE是起步後，才殺了a.exe的？ 爲什麼會發生？ 我怎樣才能同時運行兩個？ （我需要做的多線程？） 注：我在Windows平臺

Answer 1

嘗試運行每一個作爲一個單獨的線程：

import thread 

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

Answer 2

你可能想嘗試subprocess.Popen，這允許進程執行但不會阻止。但是在這個例子中你必須考慮殭屍進程。

Answer 3

您可以使用特定的方式來運行兩個或多個命令或programms的，如線程庫的Python。這裏有一個關於它如何工作的廣泛例子。

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" 

然後，你的代碼可能是這樣的：

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

如果我們忽略例外那麼簡單，同時運行幾個程序：

#!/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() 

見Python threading multiple bash subprocesses?

如果你想停止以前啓動的進程，如果任何程序失敗ls開始：

#!/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()