Add Dash live updates example (Live Bitcoin Tracker)

[ellieko]

Added a Real-time Live Bitcoin Tracker demo in examples/dash/dash-live-updates as an example of displaying real-time data in Dash

In the examples/dash/dash-live-updates directory:

For README:

• README.md
• dashboard.png

For REST API method (not used in the blog post or demo)

• rest_api_dash.py (REST API method)

For WebSocket API method (used in the blog post and demo)

• app.py (Dash app for WebSocket method)
• websocket_backend.py (Data Fetching and Storage for WebSocket method)
• requirements.txt (libraries needed for WebSocket method)

The detailed explanation is in the draft blog post. The dash app is deployed but stopped for now, because testing the demo locally would be only possible with a remote DB requirement. I can share my DB connection details via Slack if that's okay.

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📚 Documentation preview 📚: https://ploomber-doc--269.org.readthedocs.build/en/269/

[ellieko]

Recording of the deployed Dash app:

Screen.Recording.2024-08-13.at.10.21.50.PM.mov

[ellieko]

Hi @neelasha23, @bryannho, this is also ready for review. Thanks a lot! :))

Edit: the dash app is deployed here although it's not useful cuz it doesn't show anything unless websocket_backend.py is being run on my local machine.

[bryannho]

@ellieko I saw that rest_api_dash.py is included but isn't used. I think it could be useful to keep it in case users wanted to try that method. Can you add a note in the README.md explaining what the file is and that it isn't used? otherwise, lgtm

[ellieko]

@ellieko I saw that rest_api_dash.py is included but isn't used. I think it could be useful to keep it in case users wanted to try that method. Can you add a note in the README.md explaining what the file is and that it isn't used? otherwise, lgtm

Good point, thanks! Added here