executor

Executor is a class concurrent.futures.Executor which is used of offload function calls asynchronously. It immediately returns a future object which can be used to get the result.

 
def blocking_io(label: int, bytes: int):
    time.sleep(4)
    print(f'--------> FOR {label} <---------')
    
    with open('/usr/share/dict/words', 'r') as f:
        print(f.read(bytes))
        
    print('-----------------------------')
 
executor = concurrent.futures.ThreadPoolExecutor()
 
handler = executor.submit(blocking_io, 1, 100)
 
handler.add_done_callback(
                    lambda future: print(future))

There are different Executor available in concurrent.futures such as ThreadPoolExecutor to execute tasks in Threads pool.

We also have ProcessPoolExecutor for cpu bound tasks.