[DawnofGenX]

Following up on #5857. #5804 split the Quickstart into Graph Objects and Plotly Express sections — thank you for that. The Express example still doesn't run in a fresh environment, though: plotly[express] only adds numpy, and the px.bar(x=[...], y=[...]) example uses list inputs, which Plotly Express needs pandas for.

Repro on current main, clean venv:

$ pip install plotly[express]
$ python -c "import plotly.express as px; px.bar(x=['a','b','c'], y=[1,3,2])"
NotImplementedError: Pandas installation is required if no dataframe is provided.

This adds pandas to the Express install line so the example runs as written:

$ pip install plotly[express] pandas
$ python -c "import plotly.express as px; px.bar(x=['a','b','c'], y=[1,3,2])"
# -> Figure with 1 trace

The Graph Objects section is unchanged and still works with just plotly.

[camdecoster]

As I said in #5857, the README has been updated to where we want it, so we don't need these changes. The line below the px example mentions that a dataframe library is required.