Why am I getting AttributeError: Object has no attribute

I have a class MyThread. In that, I have a method sample. I am trying to run it from within the same object context. Please have a look at the code:

class myThread (threading.Thread): 
     def __init__(self, threadID, name, counter,
     redisOpsObj):
           threading.Thread.__init__(self) 
           self.threadID = threadID 
           self.name = name 
           self.counter = counter 
           self.redisOpsObj = redisOpsObj 
    def stop(self): 
          self.kill_received = True 
   def sample(self):
         print "Hello" 
   def run(self):
        time.sleep(0.1) 
        print "n Starting " + self.name 
        self.sample()

Looks very simple ain't it. But when I run it I get this error

AttributeError: 'myThread' object has no attribute 'sample'

Now I have that method, right there. So what's wrong? Please help