Plotly Express strange hover_data ValueError

[suciokhan]

Scatter plotting with no problems, until I attempted to map a column of my data to hover_data.
Here's what my data looks like. I'm trying to map the most_similar_kt column to hover_data.

Here's the error message:
ValueError: Element of value of 'hover_data' is not the name of a column in 'data_frame'. Expected one of ['x', 'y', 'label', 'freq', 'similarity', 'size', 'class', 'most_similar_kt'] but received: m

And here's my code:
fig = px.scatter(df, x='x',y='y', color='similarity', size='size', symbol='class',hover_name='label', hover_data='most_similar_kt', width=1500, height=1000, template='plotly_dark', render_mode='webgl')

Apologies if this has already been addressed; I spent 10 minutes googling for errors and it doesn't appear anyone else had this issue.

If I remove the hover_data assignment, then the plot works:

Thanks for your assistance!

[suciokhan]

Apologies; I figure out that you are supposed to feed columns inside a list rather than just a string of the column name like the other items. Closing out.

[zhaomh1998]

Had the exact same issue. This is indeed a very misleading error message though, and very much seem to be a bug as it says Expected one of ['x', 'y', 'label', 'freq', 'similarity', 'size', 'class', 'most_similar_kt'] but received: m, as you passed in hover_data='most_similar_kt'.

It would make sense if it says something like "list of column names expected but received a single str".

[emmanuelle]

@zhaomh1998 we have an open issue #2177 to improve the error message, it should be improved soon :-).

[boral]

Please fix this.

[nicolaskruchten]

We haven't gotten around to it yet... Contributions are welcome :)

[rocu-mapspeople]

just came here to say these comments helped me. :)

[StankovskiA]

The answers have helped me as well. For other newbies like myself, to pass all the columns you can do
hover_data = df.columns.tolist()
and to pass just certain columns
hover_data = [ 'col1', 'col2']