Question

I have following code which compares user input

import thread,sys
if(username.get_text() == 'xyz' and password.get_text()== '123' ):
   thread.start_new_thread(run,()) 

def run():
  print "running client"
  start = datetime.now().second
  while True:
    try:
        host ='localhost'
        port = 5010
        time = abs(datetime.now().second-start)
        time = str(time)
        print time
        client = socket.socket()
        client.connect((host,port))
        client.send(time)
    except socket.error:
        pass

If I just call the function run() it works but when I try to create a thread to run this function, for some reason the thread is not created and run() function is not executed I am unable to find any error..

Thanks in advance…

Answer 1

you really should use the threading module instead of thread.

what else are you doing? if you create a thread like this, then the interpreter will exit no matter if the thread is still running or not

for example:

import thread
import time

def run():
    time.sleep(2)
    print('ok')

thread.start_new_thread(run, ())

–> this produces:

Unhandled exception in thread started by 
sys.excepthook is missing
lost sys.stderr

where as:

import threading
import time

def run():
    time.sleep(2)
    print('ok')

t=threading.Thread(target=run)
t.daemon = True  # set thread to daemon ('ok' won't be printed in this case)
t.start()

works as expected. if you don’t want to keep the interpreter waiting for the thread, just set daemon=True* on the generated Thread.

*edit: added that in example