* Fix pytype error:
File "websocket/_wsdump.py", line 107, in <module>: Overriding method signature mismatch [signature-mismatch]
Base signature: 'def code.InteractiveConsole.raw_input(self, prompt: str = ...) -> str'.
Subclass signature: 'def RawInput.raw_input(self, prompt) -> Any'.
Parameter 'prompt' must have a default value.
* Fix pytype error:
File "websocket/tests/echo-server.py", line 18, in main: Function Serve.__init__ was called with the wrong arguments [wrong-arg-types]
Expected: (self, ws_handler, host, port: Optional[int] = ..., ...)
Actually passed: (self, ws_handler, host, port: str)
* Fix undefined variable error found by pytype:
File "compliance/test_fuzzingclient.py", line 57, in <module>: Name 'case' is not defined [name-error]