update Bars example to demo dataframe constructor

[kcpevey]

Updates the Bars example to demo dataframe constructor

I've struggled with creating Bars plots in the past. For this example, it turns out it was really easy to switch to dataframes. I thought it would be a better upgrade, but I'll submit it anyway.

I'm not sure what aspect I struggled with before (maybe I missed the aggregate step?). If I can get a better reproducible example, I'll create a new PR.

[jbednar]

Please strip out the metadata, using something like strip_kernel:

#!/bin/bash
cp "$1" /tmp/
/usr/local/bin/jq --indent 1 \
    '
    (.cells[] | select(has("outputs")) | .outputs) = []
    | (.cells[] | select(has("execution_count")) | .execution_count) = null
    | .metadata = {"language_info": {"name":"python", "pygments_lexer": "ipython3"}}
    | .cells[].metadata = {}
    ' "$1" > /tmp/stripped.ipynb
cat /tmp/stripped.ipynb > "$1"

[kcpevey]

Your snippet doesn't actually address the nbformat. Should both of those be removed completely?

[jbednar]

That's fine to leave; it needs to have some value, and whether that's 4.2 or 4.4 shouldn't matter.

[philippjfr]

Thanks @kcpevey!

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