Add vline to subplot in python

📊 Plotly Python
1

I’m trying to add a vline to a subplot (in position row 2, col 1), it works fine without subplots, but with the subplot it fails. FWIW subplot 1,1 is table. Any advice? Relevant snippets of code:

# Prepare table subplot
        fig = make_subplots(
            rows=2, cols=1, row_heights=[0.2,0.8],
            vertical_spacing=0.03,
            specs=[[{"type": "table"}],
                   [{"type": "scatter"}]]
        )

if table_cols_exist:
        # Create table and chart
        for index, trace in enumerate(data):
            if index==0:
                fig.append_trace(trace, row=1, col=1)
            else:
                fig.append_trace(trace, row=2, col=1)
    else:
        # Create chart only
        fig = go.Figure(data=data, layout=layout)

for changepoint in signif_changepoints:
            fig.add_vline(x=changepoint, line_width=0.8, line_dash="dot", line_color="darkslateblue", row=2, col=1)

which returns the following error

PlotlyKeyError: Invalid property specified for object of type plotly.graph_objs.Table: 'xaxis'
2

I came across this same issue today, and was able to resolve this error by calling the add_vline before adding the tables. Once the tables are added to the figure, the function no longer works. Hope this helps anyone else who runs across the issue!

3

The PlotlyKeyError shown above is for adding vline to a subplot with a table.

Looks like plotly does not support adding vline or hline to tables, only to graphs. Kind of make sense.

I don’t see this in plotly’s documentation, might be a good point to add.