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future.py

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import time

from concurrent.futures import Future

from threading import Thread

def worker(x, y):

print('About to work')

time.sleep(20)

print('Done')

return x + y

# Wrapper around the function to use a future

def do_work(x, y, fut):

fut.set_result(worker(x, y))

def caller():

fut = Future()

Thread(target=do_work, args=(2, 3, fut)).start()

result = fut.result()

print('Got:', result)