Sharing same legends for subplots in plotly

Question

I've two plots created in the same figure using subplots in plotly.

import plotly.graph_objects as go
import numpy as np
import pandas as pd
from plotly.subplots import make_subplots

df = pd.DataFrame(np.random.randint(0, 100, size=(20, 5)), columns=list('tABCD'))
df2 = pd.DataFrame(np.random.randint(0, 100, size=(20, 5)), columns=list('tABCD'))

fig = go.Figure()
fig = make_subplots(rows=1, cols=2)

fig.add_trace(go.Scatter(
                x=df.t,
                y=df['A'],
                name="1",
                line_color='deepskyblue',
                opacity=0.8,
                legendgroup='group1'),
                row=1, col=1
                )

fig.add_trace(go.Scatter(
                x=df.t,
                y=df['B'],
                name="2",
                line_color='dimgray',
                opacity=0.8,
                legendgroup='group2'),
                row=1, col=1
                )

fig.add_trace(go.Scatter(
                x=df.t,
                y=df['C'],
                name="3",
                line_color='blue',
                opacity=0.8,
                legendgroup='group3'),
                row=1, col=1
                )

fig.add_trace(go.Scatter(
                x=df.t,
                y=df['D'],
                name="4",
                line_color='red',
                opacity=0.8,
                legendgroup='group4'),
                row=1, col=1
                )

fig.add_trace(go.Scatter(
                x=df2.t,
                y=df2['A'],
                name="1",
                line_color='deepskyblue',
                opacity=0.8,
                legendgroup='group1'),
                row=1, col=2
                )

fig.add_trace(go.Scatter(
                x=df2.t,
                y=df2['B'],
                name="2",
                line_color='dimgray',
                opacity=0.8,
                legendgroup='group2'),
                row=1, col=2
                )

fig.add_trace(go.Scatter(
                x=df2.t,
                y=df2['C'],
                name="3",
                line_color='blue',
                opacity=0.8,
                legendgroup='group3'),
                row=1, col=2
                )

fig.add_trace(go.Scatter(
                x=df2.t,
                y=df2['D'],
                name="4",
                line_color='red',
                opacity=0.8,
                legendgroup='group4'),
                row=1, col=2
                )

fig.write_html('ts.html', auto_open=True)

Output:

I want to share the same legends for both subplots. So, I tried specifying a legend group (ref). It works, but duplicate labels appear

Any suggestions on how to remove the duplicates will be helpful

Answer 1

Adding showlegend = False in the instance where df2 is accessed will remove the duplicate legends

fig.add_trace(go.Scatter(
                x=df2.t,
                y=df2['A'],
                name="1",
                line_color='deepskyblue',
                opacity=0.8,
                legendgroup='group1',
                showlegend=False),
                row=1, col=2
                )