python - 反转图例顺序而不更改绘图快速条形图中的条形顺序

Question

我想更改plotly.express条形图图例中项目的顺序。例如，我想在此图上显示午餐前的晚餐（当前的行为对于水平条形图尤其尴尬，因为条形图的顺序与图例顺序相反）：

import plotly.express as px
df = px.data.tips()
# Sort to put dinner on top.
df.sort_values('time', ascending=False, inplace=True)
fig = px.bar(df, y='sex', x='total_bill', color='time', barmode='group',
             orientation='h')
fig.update_layout(yaxis={'categoryorder': 'total ascending'})
fig.show()

Answer 1

添加legend={'traceorder': 'reversed'}到update_layout声明中：

import plotly.express as px
df = px.data.tips()
# Sort to put dinner on top.
df.sort_values('time', ascending=False, inplace=True)
fig = px.bar(df, y='sex', x='total_bill', color='time', barmode='group',
             orientation='h')
fig.update_layout(yaxis={'categoryorder': 'total ascending'},
                  legend={'traceorder': 'reversed'})
fig.show()