CODEWITHSUNDEEP
pythonmultithreadingpython-multithreading
skrowten_hermit
skrowten_hermit

Reputation: 445

Multithreading : defining thread as a class

I have the following program that I wrote to implement thread as a class. 

import threading
import datetime
import time

class MyThread(threading.Thread):
    def __init__(self,i):
        threading.Thread.__init__(self)
        self.i=i

    def prints(self):
        while(self.i>0):
            print "i="+str(self.i)+" "+str(datetime.datetime.now().time())+"\n"
            self.i=self.i-1
            time.sleep(1)
        return

t1=MyThread(3)
t2=MyThread(5)
time.sleep(1)
t1.start()
t2.start()
#t1.join()
#t2.join()

Even though it executes without throwing any errors, I don't see the output I'm expecting i.e, prints of i=3 to 1 in one thread and prints of i=5 to 1 in another thread. In fact, there is no output at all. And the code looks fine to me. I even tried adding sleep statements, no avail. What could possibly have gone wrong?

Upvotes: 0

Views: 63

Answers (2)

ᴀʀᴍᴀɴ
ᴀʀᴍᴀɴ

Reputation: 4528

You never call prints function , you should call prints in run function that overrides from Thread class:

class MyThread(threading.Thread):
    def __init__(self,i):
        threading.Thread.__init__(self)
        self.i=i
   def run(self):
        self.prints()

and also you should import datetime and this is output:

i=3 16:55:36.903809
i=5 16:55:36.904809


i=2 16:55:37.966870
i=4 16:55:37.967870


i=1 16:55:38.972927
i=3 16:55:38.973927


i=2 16:55:39.979985

i=1 16:55:40.984042

Upvotes: 3

zondo
zondo

Reputation: 20336

Nowhere do you call prints(); you merely define it. If you call it run instead, the threading class will call it. You could also keep the name but define a separate run method that calls it.

Upvotes: 2

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