UDP datagrams in Python

Connectionless messaging with SOCK_DGRAM sockets.

import socket

listener = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
listener.bind(("127.0.0.1", 9999))
listener.settimeout(2)

sender = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sender.sendto(b"ping", ("127.0.0.1", 9999))

data, addr = listener.recvfrom(1024)
listener.sendto(b"pong", addr)

sender.close()
listener.close()

How it works

1. sendto fires a datagram at an address.
2. recvfrom returns the data and the sender.
3. No handshake: packets just go.

The run, in numbers

Lines

14

Characters to type

337

Tokens

96

Three-star pace

105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 55 seconds.

Type this snippet

Step 3 of 4 in Sockets & networking, step 8 of 41 in Domain tools.

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