go.Box, graph is just one line

📊 Plotly Python
1

I am plotting boxplots over time, in two groups. To do so, I use the following code:


traces = []

for j in _ab_["Date"].unique():
    dt_mk = ( _ab_["Date"] == j )
    _a_mk = ( _ab_["group"] == "control" )
    _b_mk = ( _ab_["group"] == "treatment" )

    trace0 = go.Box(x=[j], y=_ab_[dt_mk & _a_mk]["time_on_site"], marker_color=colors_lst[0], showlegend=False)
    trace1 = go.Box(x=[j], y=_ab_[dt_mk & _b_mk]["time_on_site"], marker_color=colors_lst[1], showlegend=False)
                    
    traces.append(trace0)
    traces.append(trace1)

go.Figure(traces)

Where the variables are pretty self-explanatory, and the resulting y value is an array of len ~ 1000. For some (probably obvious) reason, the graph prints just one vertical line for each box, as shown here:

newplot (29)
newplot (29)917×360 3.42 KB

Any ideas as to what’s causing this?