Python Language Sockets Sending data via UDP


UDP is a connectionless protocol. Messages to other processes or computers are sent without establishing any sort of connection. There is no automatic confirmation if your message has been received. UDP is usually used in latency sensitive applications or in applications sending network wide broadcasts.

The following code sends a message to a process listening on localhost port 6667 using UDP

Note that there is no need to "close" the socket after the send, because UDP is connectionless.

from socket import socket, AF_INET, SOCK_DGRAM
s = socket(AF_INET, SOCK_DGRAM)
msg = ("Hello you there!").encode('utf-8')  # socket.sendto() takes bytes as input, hence we must encode the string first.
s.sendto(msg, ('localhost', 6667))