/Python/Global variable not accessible withing thread

Global variable not accessible withing thread

from threading import Thread
from queue import Queue
import time

def thread1(threadname, q):
    #read variable "a" modify by thread 2
    while True:
        a = q.get()
        if a is None: return # Poison pill
        print a

def thread2(threadname, q):
    a = 0
    for _ in xrange(10):
        a += 1
        q.put(a)
        time.sleep(1)
    q.put(None) # Poison pill

queue = Queue()
thread1 = Thread( target=thread1, args=("Thread-1", queue) )
thread2 = Thread( target=thread2, args=("Thread-2", queue) )

thread1.start()
thread2.start()
thread1.join()
thread2.join()

Source: stackoverflow.com

Similar codes

0 vote256 views1 answer
No module named 'pygame' visual studio
Python
0 vote244 views1 answer
Doctest python
Python
2 votes252 views2 answers
Subplots matplotlib examples
Python
2 votes258 views3 answers
List inside a list in python
Python
1 vote241 views3 answers
Inheritance in python 3 example
Python
25 votes257 views2 answers
Django create app command
Python
0 vote252 views1 answer
Using loc pandas
Python
0 vote257 views1 answer
Pandas snippets
Python
0 vote251 views1 answer
Excelwriter python
Python
0 vote257 views1 answer
How to make html files open in chrome using python
Python