python可视化plotly 图例(legend)设置

import plotly.io as pio
import plotly.express as px
import plotly.graph_objects as go
from plotly.subplots import make_subplots
import pandas as pd
import numpy as np

# 设置plotly默认主题
pio.templates.default = 'plotly_white'

# 设置pandas打印时显示所有列
pd.set_option('display.max_columns', None)

df = px.data.gapminder().query("year==2007")
fig = px.scatter(df, x="gdpPercap", y="lifeExp", color="continent",
    size="pop", size_max=45, log_x=True)

fig.update_layout(legend=dict(
    yanchor="top",
    y=0.99,
    xanchor="left",
    x=0.01
))

fig.write_image('../pic/legend_1.png', scale=2)
fig.show()

df = px.data.gapminder().query("year==2007")
fig = px.scatter(df, x="gdpPercap", y="lifeExp", color="continent",
    size="pop", size_max=45, log_x=True)

fig.update_layout(legend=dict(
    orientation="h",
    yanchor="bottom",
    y=1.02,
    xanchor="center",
    x=0.5,
    title_text=''
))

fig.write_image('../pic/legend_2.png', scale=2)
fig.show()

df = px.data.gapminder().query("year==2007")
fig = px.scatter(df, x="gdpPercap", y="lifeExp", color="continent",
    size="pop", size_max=45, log_x=True)


fig.update_layout(
    legend=dict(
        x=0,
        y=1,
        traceorder="reversed",
        title_font_family="Times New Roman",
        font=dict(
            family="Courier",
            size=12,
            color="black"
        ),
        bgcolor="LightSteelBlue",
        bordercolor="Black",
        borderwidth=2
    )
)

fig.write_image('../pic/legend_3.png', scale=2)
fig.show()

fig = go.Figure()

# 使用 name 参数指定条目文本，legendrank 指定顺序
fig.add_trace(go.Bar(name="fourth", x=["a", "b"], y=[2,1], legendrank=4))
fig.add_trace(go.Bar(name="second", x=["a", "b"], y=[2,1], legendrank=2))
fig.add_trace(go.Bar(name="first", x=["a", "b"], y=[1,2], legendrank=1))
fig.add_trace(go.Bar(name="third", x=["a", "b"], y=[1,2], legendrank=3))

fig.write_image('../pic/legend_4.png', scale=2)
fig.show()

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=[1, 2, 3],
    y=[2, 1, 3],
    legendgroup="group",  # this can be any string, not just "group"
    legendgrouptitle_text="First Group Title",
    name="first legend group",
    mode="markers",
    marker=dict(color="Crimson", size=10)
))

fig.add_trace(go.Scatter(
    x=[1, 2, 3],
    y=[2, 2, 2],
    legendgroup="group",
    name="first legend group - average",
    mode="lines",
    line=dict(color="Crimson")
))

fig.add_trace(go.Scatter(
    x=[1, 2, 3],
    y=[4, 9, 2],
    legendgroup="group2",
    legendgrouptitle_text="Second Group Title",
    name="second legend group",
    mode="markers",
    marker=dict(color="MediumPurple", size=10)
))

fig.add_trace(go.Scatter(
    x=[1, 2, 3],
    y=[5, 5, 5],
    legendgroup="group2",
    name="second legend group - average",
    mode="lines",
    line=dict(color="MediumPurple")
))

fig.update_layout(title="Try Clicking on the Legend Items!")

fig.write_image('../pic/legend_5.png', scale=2)
fig.show()

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[1, 2, 3, 4, 5],
))

fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[5, 4, 3, 2, 1],
    visible='legendonly'
))

fig.write_image('../pic/legend_6.png', scale=2)
fig.show()

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[1, 2, 3, 4, 5],
    showlegend=False
))


fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[5, 4, 3, 2, 1],
))

fig.update_layout(showlegend=True)

fig.write_image('../pic/legend_7.png', scale=2)
fig.show()

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[1, 2, 3, 4, 5],
    mode='markers',
    marker={'size':10}
))

fig.add_trace(go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[5, 4, 3, 2, 1],
    mode='markers',
    marker={'size':100}
))

fig.update_layout(legend= {'itemsizing': 'trace'})

fig.write_image('../pic/legend_8.png', scale=2)
fig.show()