>>> import socket
>>> sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>>> sk.bind(("0.0.0.0", 43892))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 98] Address already in use
>>> sk.bind(("0.0.0.0", 43893))
>>> sk.listen(128)
>>> client, address = sk.accept()
>>> client.send(b"foo")
3