AttributeError: 'module' object has no attribute 'WebSocketApp'
It looks like you're trying to use features of the websocket-client package and not just the websocket package. Pip-install websocket-client from the command line (or install it using whatever other package manager you have), then try running your code again.
pip install websocket-client
Make sure that you didn't name your file as websocket.py; Otherwise, it will prevent import of the desired third-party module websocket; because your module is searched first according to sys.path module search path.
Rename your module to other name, and make sure to clean websocket.pyc if there it is.