Python 为什么线程中调用函数的部分代码没有被执行

我在联机中找到了这段代码，在运行这段代码时，我发现printThis非常糟糕{}。formatself这部分没有被执行。但是如果我 如果不使用if-like运行，则两个函数都是自连接的。我不知道为什么会发生这种情况。你能描述一下吗

 class MyThread(Thread):
     def __init__(self, val):
        ''' Constructor. '''
        Thread.__init__(self)
        self.val = val



 def run(self):
     for i in range(1, self.val):
         print('Value %d in thread %s' % (i, self.getName()))
         self.printing_fun()
         # Sleep for random time between 1 ~ 3 second
         #secondsToSleep = randint(1, 5)

         #time.sleep(secondsToSleep)

 def connecting(self):
     print "Establishing connection right now........."

 def printing_fun(self):
     # if i run like self.connecting() without previous if then all are 
     working fine.
     if  self.connecting():
      print("This is awefull {}".format(self)) 

# Run following code when the program starts
if __name__ == '__main__':
   # Declare objects of MyThread class
   myThreadOb1 = MyThread(4)
   myThreadOb1.setName('Thread 1')

   myThreadOb2 = MyThread(4)
   myThreadOb2.setName('Thread 2')



# Start running the threads!
   myThreadOb1.start()
   myThreadOb2.start()

   # Wait for the thre`enter code here`ads to finish...
   myThreadOb1.join()
   myThreadOb2.join()

   print('Main Terminating...')

结果:

---

与线程无关。请看以下代码：

def connecting(self):
     print "Establishing connection right now........."

def printing_fun(self):
     # if i run like self.connecting() without previous if then all are 
     # working fine.
     if  self.connecting():
      print("This is awefull {}".format(self)) 

self.connecting没有return语句，因此python使其返回None

如果没有：条件永远不会满足：它永远不会进入if

连接是某些连接过程的存根，但它的实现不正确。要正确地存根，您应该让它返回真实的内容：

def connecting(self):
     print("Establishing connection right now.........")
     return True

---

self.connecting不返回任何内容，因此python不返回任何内容。这是falsy：所以条件总是False你的连接方法不返回布尔值，所以它总是被计算为'False'运算，我知道了..谢谢@Jean Françoisfare

def connecting(self):
     print("Establishing connection right now.........")
     return True