Best method to add Trace to existing Figure

📊 Plotly Python
1

Hi all,

what is the best plotly way to add one or more Trace(s) to an existing Figure object using the output of plotly express? One scenario could be:

import plotly.express as px
import plotly.graph_objects as go

fig = go.Figure()
trace1= px.line(x=["a","b","c"], y=[1,3,2], title="first trace")
trace2 = px.line(x=["a","b","c"], y=[50,70,90], title="second trace")

fig.add_trace(trace1.data[0])
fig.add_trace(trace2.data[0])

fig.show()

then we can explicit add the type of plot to the figure (notice also the change from title to name)::


import plotly.express as px
import plotly.graph_objects as go

fig = px.line(x=["a","b","c"], y=[1,3,2], title="first trace")

fig.add_scatter(x=["a","b","c"], y=[50,70,90], name="second trace")

fig.show()

and another one mixes plotly express and graph objects:

import plotly.express as px
import plotly.graph_objects as go

fig = px.line(x=["a","b","c"], y=[1,3,2], title="first trace")

fig.add_trace(go.Scatter(x=["a","b","c"], y=[50,70,90], name="second trace"))

fig.show()

I think all the methods are valid by I’m unsure what is the best one

Thanks to all!

Matteo

2 Likes
2

Dear Matteo @ghtmtt

Hi

Interesting topic and Useful!.

I had problem with adding a px.line_3d to the figure and I couldn’t add it using fig.add_trace(go.line_3d) because go doesn’t have line_3d and for some reasons I can’t use go.Scatter3d But your first scenario helped me :+1: