Learn Web Development with Python

A thread's local data

The threading module offers a way to implement local data for threads. Local data is an object that holds thread-specific data. Let me show you an example, and allow me to sneak in a Barrier too, so I can tell you how it works:

# local.pyimport threadingfrom random import randintlocal = threading.local()def run(local, barrier):    local.my_value = randint(0, 10**2)    t = threading.current_thread()    print(f'Thread {t.name} has value {local.my_value}')    barrier.wait()    print(f'Thread {t.name} still has value {local.my_value}')count = 3barrier = threading.Barrier(count)threads = [    threading.Thread(        target=run, name=f'T{name}', args=(local, barrier)    ) for name in range(count)]for t in threads:    t.start()

We start by defining local ...