如何在 yaxis 上為 plotly 中的方面 plot 保留 1 個 label？

Question

我從https://plotly.com/python/facet-plots/得到這個例子。 如何使 yaxis label 只有 1 個 label “lifeExp”，而不是所有 yaxes 的地塊都有 label？

import plotly.express as px

df = px.data.gapminder().query("continent == 'Africa'")

fig = px.line(df, x="year", y="lifeExp", facet_col="country", facet_col_wrap=7,
              facet_row_spacing=0.04, # default is 0.07 when facet_col_wrap is used
              facet_col_spacing=0.04, # default is 0.03
              height=600, width=800,
              title="Life Expectancy in Africa")
fig.for_each_annotation(lambda a: a.update(text=a.text.split("=")[-1]))
fig.update_yaxes(showticklabels=True)
fig.show()

Answer 1

您可以替換每個 plot 的 y 軸標題，然后為整個布局添加注釋，類似於 x 軸：

import plotly.express as px

df = px.data.gapminder().query("continent == 'Africa'")

fig = px.line(df, x="year", y="lifeExp", facet_col="country", facet_col_wrap=4,
              facet_row_spacing=0.02,
              facet_col_spacing=0.02, 
              height=1200, width=1000,
              title="Life Expectancy in Africa")


fig.add_annotation(text=fig['layout']['yaxis']['title']['text'],
                  xref="paper", yref="paper",
                  x=-0.07, y=0.5, showarrow=False,textangle=-90)

fig.add_annotation(text=fig['layout']['xaxis']['title']['text'],
                  xref="paper", yref="paper",
                  x=0.5, y=-0.07, showarrow=False)


fig.update_yaxes(title="")
fig.update_xaxes(title="")
fig.show()