[Python] Threading issue causing inconsistent results in Python

Threading code with shared global variable counter gives inconsistent results. How to fix thread safety in Python?

import threading

counter = 0

def increment():
global counter
for _ in range(1000):
counter += 1

def decrement():
global counter
for _ in range(1000):
counter -= 1

threads = []
for _ in range(5):
threads.append(threading.Thread(target=increment))
threads.append(threading.Thread(target=decrement))

for thread in threads:
thread.start()

for thread in threads:
thread.join()

print(f"Counter value: {counter}")

Continue reading...