I have just installed Jupyter over pip (Python version is 3.7.2) in Windows 10, started the jupyter server by calling <code>jupyter notebook</code>, created a new notebook with kernel python3 in my web browser but a connection to the kernel is never achieved.
I have just installed Jupyter over pip (Python version is 3.7.2) in Windows 10, started the jupyter server by calling
jupyter notebook, created a new notebook with kernel python3 in my web browser but a connection to the kernel is never achieved.
No obvious error in the command line:
C:\Users\xxxx>jupyter notebook [I 21:18:21.005 NotebookApp] Serving notebooks from local directory: C:\Users\xxxx [I 21:18:21.005 NotebookApp] The Jupyter Notebook is running at: [I 21:18:21.006 NotebookApp] http://localhost:8888/?token=5743fcbbc805efa4b36c983a7beb63b95cf922957378d64f [I 21:18:21.007 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation). [C 21:18:21.087 NotebookApp]
To access the notebook, open this file in a browser: file:///C:/Users/xxxx/AppData/Roaming/jupyter/runtime/nbserver-18416-open.html Or copy and paste one of these URLs: http://localhost:8888/?token=5743fcbbc805efa4b36c983a7beb63b95cf922957378d64f
[I 21:18:33.777 NotebookApp] Creating new notebook in [I 21:18:35.512 NotebookApp] Kernel started: ab30c1b3-55d2-45e9-9f01-b4bfc077bb01 [I 21:18:36.883 NotebookApp] Adapting to protocol v5.1 for kernel ab30c1b3-55d2-45e9-9f01-b4bfc077bb01 c:\users\xxxx\appdata\local\programs\python\python37-32\lib\site-packages\notebook\base\zmqhandlers.py:284: RuntimeWarning: coroutine 'WebSocketHandler.get' was never awaited super(AuthenticatedZMQStreamHandler, self).get(args, *kwargs) RuntimeWarning: Enable tracemalloc to get the object allocation traceback [W 21:18:37.912 NotebookApp] Replacing stale connection: ab30c1b3-55d2-45e9-9f01-b4bfc077bb01:397de5420f9e4bce82d95967bf5fa1eb [W 21:19:14.026 NotebookApp] 404 GET /static/components/preact/preact.min.js.map (::1) 18.98ms referer=None [W 21:19:14.040 NotebookApp] 404 GET /static/components/preact-compat/preact-compat.min.js.map (::1) 6.49ms referer=None [W 21:19:14.050 NotebookApp] 404 GET /static/components/proptypes/index.js.map (::1) 15.99ms referer=None [I 21:20:36.067 NotebookApp] Saving file at /Untitled1.ipynb [W 21:22:40.052 NotebookApp] Replacing stale connection: ab30c1b3-55d2-45e9-9f01-b4bfc077bb01:397de5420f9e4bce82d95967bf5fa1eb
I have tried all Chrome, Firefox and Microsoft Edge with no success. I even tried through PyCharm.
I then looked at the js console of the browser and seems that the problem is a failure in the websocket connection:
menubar.js:277 actions jupyter-notebook:find-and-replace does not exist, still binding it in case it will be defined later... MenuBar.bind_events @ menubar.js:277 utils.js:60 load_extensions Arguments(1) bidi.js:19 Loaded moment locale en utils.js:37 Loading extension: jupyter-js-widgets/extension session.js:54 Session: kernel_created (003a523b-3d40-41ac-b65e-154db92d5528) kernel.js:459 Starting WebSockets: ws://localhost:8888/api/kernels/f8809bf9-988f-4666-b183-e01bed63fa76 kernel.js:461 WebSocket connection to 'ws://localhost:8888/api/kernels/f8809bf9-988f-4666-b183-e01bed63fa76/channels?session_id=e49c21f065e64e7a89847a0859d689dd' failed: Error during WebSocket handshake: Unexpected response code: 200 Kernel.start_channels @ kernel.js:461 kernel.js:103 Kernel: kernel_disconnected (f8809bf9-988f-4666-b183-e01bed63fa76) kernel.js:544 WebSocket connection failed: ws://localhost:8888/api/kernels/f8809bf9-988f-4666-b183-e01bed63fa76 true kernel.js:562 Connection lost, reconnecting in 1 seconds. kernel.js:103 Kernel: kernel_reconnecting (f8809bf9-988f-4666-b183-e01bed63fa76) kernel.js:459 Starting WebSockets: ws://localhost:8888/api/kernels/f8809bf9-988f-4666-b183-e01bed63fa76
What could be the reason here?
In the programming world, Data types play an important role. Each Variable is stored in different data types and responsible for various functions. Python had two different objects, and They are mutable and immutable objects.
Magic Methods are the special methods which gives us the ability to access built in syntactical features such as ‘<’, ‘>’, ‘==’, ‘+’ etc.. You must have worked with such methods without knowing them to be as magic methods. Magic methods can be identified with their names which start with __ and ends with __ like __init__, __call__, __str__ etc. These methods are also called Dunder Methods, because of their name starting and ending with Double Underscore (Dunder).
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Python any() function returns True if any element of an iterable is True otherwise any() function returns False. The syntax is any().