human
Complete the below
def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None):

    ''''Start up a socket server on the specified port, and listen for new
    configurations.
    These will be sent as a file suitable for processing by fileConfig().
    Returns a Thread object on which you can call start() to start the server,
    and which you can join() when appropriate. To stop the server, call
    stopListening().
    Use the ``verify`` argument to verify any bytes received across the wire
    from a client. If specified, it should be a callable which receives a
    single argument - the bytes of configuration data received across the
    network - and it should return either ``None``, to indicate that the
    passed in bytes could not be verified and should be discarded, or a
    byte string which is then passed to the configuration machinery as
    normal. Note that you can return transformed bytes, e.g. by decrypting
    the bytes passed in.'
    '''
assistant
#Here is the Python code you requested.
    if (not thread):
        raise NotImplementedError('listen()    needs    threading    to    work')
    class ConfigStreamHandler(StreamRequestHandler, ):
        '\n                                Handler    for    a    logging    configuration    request.\n\n                                It    expects    a    completely    new    logging    configuration    and    uses    fileConfig\n                                to    install    it.\n                                '
        def handle(self):
            '\n                                                Handle    a    request.\n\n                                                Each    request    is    expected    to    be    a    4-byte    length,    packed    using\n                                                struct.pack(">L",    n),    followed    by    the    config    file.\n                                                Uses    fileConfig()    to    do    the    grunt    work.\n                                                '
            try:
                conn = self.connection
                chunk = conn.recv(4)
                if (len(chunk) == 4):
                    slen = struct.unpack('>L', chunk)[0]
                    chunk = self.connection.recv(slen)
                    while (len(chunk) < slen):
                        chunk = (chunk + conn.recv((slen - len(chunk))))
                    if (self.server.verify is not None):
                        chunk = self.server.verify(chunk)
                    if (chunk is not None):
                        chunk = chunk.decode('utf-8')
                        try:
                            import json
                            d = json.loads(chunk)
                            assert isinstance(d, dict)
                            dictConfig(d)
                        except Exception:
                            file = io.StringIO(chunk)
                            try:
                                fileConfig(file)
                            except Exception:
               ...