def __init__(self, connectedDeferred, wrappedProtocol):
        """
        @param connectedDeferred: The L{Deferred} that will callback
            with the C{wrappedProtocol} when it is connected.

        @param wrappedProtocol: An L{IProtocol} provider that will be
            connected.
        """
        self._connectedDeferred = connectedDeferred
        self._wrappedProtocol = wrappedProtocol

        for iface in [interfaces.IHalfCloseableProtocol,
                      interfaces.IFileDescriptorReceiver,
                      interfaces.IHandshakeListener]:
            if iface.providedBy(self._wrappedProtocol):
                directlyProvides(self, iface)

        @param connectedDeferred: The L{Deferred} that will callback
            with the C{wrappedProtocol} when it is connected.

        @param wrappedProtocol: An L{IProtocol} provider that will be
            connected.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/endpoints.py