from concurrent.futures import Future

import threading

def network_request_async(number):

future = Future()

result = {"success": True, "result": number ** 2}

timer = threading.Timer(1.0, lambda: future.set_result(result))

timer.start()

return future

def fetch_square(number):

fut = network_request_async(number)

def on_done_future(future):

response = future.result()

if response["success"]:

print("Result is: {}".format(response["result"]))

fut.add_done_callback(on_done_future)

if __name__ == "__main__":

### First try

fut = network_request_async(2)

### Second try

# fetch_square(2)