[b84330808]

Fault and ProtocolError call Error.__init__() without arguments, so args is empty and unpickling calls the constructor with no arguments:

>>> pickle.loads(pickle.dumps(xmlrpc.client.Fault(42, "x")))
TypeError: Fault.__init__() missing 2 required positional arguments: 'faultCode' and 'faultString'

This passes the constructor arguments to Error.__init__(), the same way the configparser and smtplib exceptions do. This matters for multiprocessing, which pickles exceptions raised in workers. str() and repr() don't change (Error.__str__ is object.__str__); the only visible difference is that args now holds the constructor arguments instead of ().

I used Claude Code to write this change.

• Issue: unpickling an xmlrpc.client.Fault raises TypeError #71468