How not to use asyncio

bad_asyncio_example.py

import asyncio
import socket

async def alice():
    print("started alice")
    # alice's task starts: she attempts to connect to Bob's server
    while True:
        try:
            # this is where we try to connect to bob's server
            # if the server hasn't started, we try again
            # but we never reach the point of being able to try again (see bob's code)
            conn = socket.create_connection(('127.0.0.1', 1337))
        except Exception as e:
            print(f"got exception {e}, retrying...")
            await asyncio.sleep(1)

    # proceed with diffie-hellman, using conn to communicate with bob
    print("alice never reaches this point")

async def bob():
    print("started bob")
    # bob's task starts: he spins up a server and listens for incoming connections
    sock = socket.create_server(('127.0.0.1', 1337))

    # this is a blocking call, which halts execution of the asyncio event loop
    print("waiting for connections...")
    conn, _ = sock.accept()

    # this is where we would proceed with diffie-hellman, if we ever got to this point
    print("bob never reaches this point")

async def main():
    # create tasks
    run_alice = asyncio.create_task(alice())
    run_bob = asyncio.create_task(bob())

    # run them concurrently
    await asyncio.gather(run_alice, run_bob)

if __name__ == '__main__':
    asyncio.run(main())