Mastering GUI Programming with Python

Building a UDP chat client

UDP is most commonly used in broadcast applications on local networks, so to demonstrate this, we're going to make our UDP chat a local-network-only broadcast chat. That means that any computer on a local network running a copy of this application will be able to view and participate in the conversation.

We'll start by creating our backend class, which we'll call UdpChatInterface:

class UdpChatInterface(qtc.QObject):    port = 7777    delimiter = '||'    received = qtc.pyqtSignal(str, str)    error = qtc.pyqtSignal(str)

Our backend inherits QObject so that we can use Qt signals, of which we've defined two—a received signal that we'll emit when a message is received, and an error signal that we'll emit when an error happens. ...