的Python - 線程 - 同時執行

Question

我有這樣的例子代碼：

# some imports that I'm not including in the question 

class daemon: 
    def start(self): 
     # do something, I'm not including what this script does to not write useless code to the question 
     self.run() 

    def run(self): 
     """You should override this method when you subclass Daemon. 

     It will be called after the process has been daemonized by 
     start() or restart(). 
     """ 

class MyDaemon(daemon): 
    def run(self): 
     while True: 
      time.sleep(1) 

if __name__ == "__main__": 
    daemonz = MyDaemon('/tmp/daemon-example.pid') 
    daemonz.start() 

def firstfunction(): 
    # do something 
    secondfunction() 

def secondfunction(): 
    # do something 
    thirdfunction() 

def thirdfunction(): 
    # do something 

# here are some variables set that I am not writing 
firstfunction() 

如何從類「守護」的運行（個體經營）函數退出並執行了firstFunction會（）一樣寫在最後一行？我是一個Python的新手，我試圖學習

＃編輯 我設法將守護程序類實現到treading類。但是我首先處於相同的情況，腳本停留在守護進程類中，不執行其他行。

class MyThread(threading.Thread): 
    def __init__(self): 
     threading.Thread.__init__(self) 

    def daemonize(self): 
    # istructions to daemonize my script process 

    def run(self): 
     self.daemonize() 


def my_function(): 
    print("MyFunction executed") # never executed 

thread = MyThread() 
thread.start() 
my_function() # the process is successfully damonized but 
       # this function is never executed 

Answer 1

您可以使用關鍵字break退出循環，並繼續到下一行。 return可用於退出功能。

class daemon: 
    def start(self): 
     self.run() 

    def run(self): 
     while True: 
      break 
     return 
     print() # This never executes 

如果你想MyDaemon並肩你的代碼的其餘部分運行，你必須使它進程或線程。然後代碼自動繼續到下一行，而MyDaemon類（線程/進程）運行。

import threading 


class MyThread(threading.Thread): 
    def __init__(self): 
     threading.Thread.__init__(self) 

    def run(self): 
     print("Thread started") 
     while True: 
      pass 


def my_function(): 
    print("MyFunction executed") 

thread = MyThread() 
thread.start()  # executes run(self) 
my_function() 

此代碼將產生以下結果：

Thread started 
MyFunction executed 

爲了thread一個守護進程，你可以使用thread.setDaemon(True)。該功能必須在線程啓動之前調用：

thread = MyThread() 
thread.setDaemon(True) 
thread.start() 
my_function()