human
Here's a good function header given the following:
I wrote the below code

    if (hostMap is None):
        hostMap = {}
    hostMap = hostMap.copy()
    @implementer(IHostnameResolver)
    class SimpleNameResolver(object, ):
        @staticmethod
        def resolveHostName(resolutionReceiver, hostName, portNumber=0, addressTypes=None, transportSemantics='TCP'):
            resolutionReceiver.resolutionBegan(None)
            for expectedAddress in hostMap.get(hostName, expectedAddresses):
                if isinstance(expectedAddress, str):
                    expectedAddress = [IPv4Address, IPv6Address][isIPv6Address(expectedAddress)]('TCP', expectedAddress, portNumber)
                resolutionReceiver.addressResolved(expectedAddress)
            resolutionReceiver.resolutionComplete()
    @implementer(IReactorPluggableNameResolver)
    class WithResolver(proxyForInterface(InterfaceClass('*', tuple(providedBy(reactor)))), ):
        nameResolver = SimpleNameResolver()
    return WithResolver(reactor)

What's a good function header?
assistant
#Here's a good function header.

def deterministicResolvingReactor(reactor, expectedAddresses=(), hostMap=None):