Add realtime/historical adapter example with wikimedia data

[melissawm]

This is a more complete example of csp features, highlighting how to write a realtime adapter and how to use the existing CSVReader adapter for historical data.

I'd be happy to hear if there are other things we want to highlight in this example, or if there are better ways to present the information. This notebook does not include the outputs since they can be very large and include visual elements. I would recommend downloading and running locally.

[AdamGlustein]

Currently can't run the example in a Python 3.8 environment, please see the below comments.

[timkpaine]

Needs tests, needs adding to examples/02_intermediate/README.md

[timkpaine]

You can initialize your table statically with a schema (you also dont need a Table, you can interact directly with the widget)

{"servername": str, "timestamp": datetime, "event", str, "servername_count": int}

[melissawm]

Needs tests, needs adding to examples/02_intermediate/README.md

By tests do you mean something like https://pytest-notebook.readthedocs.io/en/latest/? Do you have another tool in mind?

One thing I have encountered here is that sometimes the realtime example will hang and kill the jupyter kernel. Maybe I am not ending the thread correctly, so if you have thoughts on that it would be great.

[timkpaine]

Will discuss testing and org more next week
xref: #246 (comment)

[melissawm]

I have simplified the widget definition and fixed the historical data to be 2 days before execution of the notebooks.

I suggest the tests be addressed in a follow-up so this can be merged as discussed. I can't merge myself because of the requested changes, but feel free to merge any time.

stale

[robambalu]

#225 (comment)