/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

1 vote287 views1 answer
Solving linear equation using numpy
Python
0 vote306 views1 answer
Python check variable is tuple
Python
0 vote290 views1 answer
Python to open .seg file
Python
0 vote274 views1 answer
Renaming Column Name Dataframe
Python
21 votes283 views3 answers
List of strings to numbers python
Python
1 vote317 views1 answer
Openpyxl write in cell
Python
1 vote281 views1 answer
Tqdm remove progress bar when done
Python
1 vote274 views1 answer
Python auto reload module ipython
Python
1 vote289 views1 answer
Generate number of n bits python
Python
4 votes303 views4 answers
Python list all columns in dataframe
Python