Executing ThreadPoolExecutor with Context Manager

Another way to instantiate ThreadPoolExecutor to use it as a context manager with the with statement:
with ThreadPoolExecutor(max_workers=2) as executor:

In this example, within our main function, we use our ThreadPoolExecutor as a context manager and then call future = executor.submit(message, (message)) twice to process each message in the threadpool.

You can find the following code in the threadPoolConcurrency2.py file in concurrency subfolder:

from concurrent.futures import ThreadPoolExecutor

def message(message):
 print("Processing {}".format(message))

def main():
 print("Starting ThreadPoolExecutor")
 with ThreadPoolExecutor(max_workers=2) as executor:
   future = executor.submit(message, ("message 1"))
   future = executor.submit(message, ("message 2"))
 print("All messages complete")

if __name__ == '__main__':
 main()