fix flake8 warnings

proxy.py

@@ -33,7 +33,7 @@ class ProxyClientProtocol(protocol.Protocol):
         self.cli_queue.get().addCallback(self.serverDataReceived)
 
     def serverDataReceived(self, chunk):
-        if chunk is False:
+        if not chunk:
             self.cli_queue = None
             logger.info("Client(%s): disconnecting from qemu (%s)",
                         self.factory.src, self.dst)
@@ -105,7 +105,7 @@ class VNCWebSocketHandler(Protocol):
         reactor.connectTCP(host, int(port), factory)
 
     def clientDataReceived(self, chunk):
-        if chunk is False:
+        if not chunk:
             self.transport.loseConnection()
         else:
             logger.debug("Server(%s): writing %d bytes to original client",

websockets.py

@@ -12,10 +12,6 @@ factory.
 @since: 13.2
 """
 
-__all__ = ["WebSocketsResource", "IWebSocketsFrameReceiver",
-           "lookupProtocolForFactory", "WebSocketsProtocol",
-           "WebSocketsProtocolWrapper", "CONTROLS", "STATUSES"]
-
 import base64
 
 from hashlib import sha1
@@ -31,6 +27,11 @@ from twisted.web.resource import IResource
 from twisted.web.server import NOT_DONE_YET
 
 
+__all__ = ["WebSocketsResource", "IWebSocketsFrameReceiver",
+           "lookupProtocolForFactory", "WebSocketsProtocol",
+           "WebSocketsProtocolWrapper", "CONTROLS", "STATUSES"]
+
+
 class _WSException(Exception):
     """
     Internal exception for control flow inside the WebSockets frame parser.
@@ -457,7 +458,7 @@ class _WebSocketsProtocolWrapperReceiver():
         @type fin: C{bool}
         @param fin: Whether or not the frame is final.
         """
-        if not opcode in (CONTROLS.BINARY, CONTROLS.TEXT, CONTROLS.CONTINUE):
+        if opcode not in (CONTROLS.BINARY, CONTROLS.TEXT, CONTROLS.CONTINUE):
             return
         self._messages.append(data)
         if fin: