python - Plotly中条形图的单独标记的条

我试图为分组条形图创建注释，其中每个条都有一个特定的数据标签，显示了该条的值，并位于该条的中心上方。
为了实现这一点，我尝试对教程中的示例进行了简单的修改，如下所示：

import plotly.plotly as py
import plotly.graph_objs as go

x = ['Product A', 'Product B', 'Product C']
y1 = [20, 14, 23]
y2 = [12, 18, 29]

annotations1 = [dict(
            x=xi,
            y=yi,
            text=str(yi),
            xanchor='auto',
            yanchor='bottom',
            showarrow=False,
        ) for xi, yi in zip(x, y1)]
annotations2 = [dict(
            x=xi,
            y=yi,
            text=str(yi),
            xanchor='auto',
            yanchor='bottom',
            showarrow=False,
        ) for xi, yi in zip(x, y2)]
annotations = annotations1 + annotations2

trace1 = go.Bar(
    x=x,
    y=y1,
    name='SF Zoo'
)
trace2 = go.Bar(
    x=x,
    y=y2,
    name='LA Zoo'
)
data = [trace1, trace2]
layout = go.Layout(
    barmode='group',
    annotations=annotations
)
fig = go.Figure(data=data, layout=layout)
plot_url = py.plot(fig, filename='stacked-bar')

这就产生了这个情节：https://plot.ly/~ashish.baghudana/49.embed
然而，数据标签不是集中在单个的条上，而是集中在每一组条的中心上。我想知道是否有一个解决办法，而不是手动注释。

最佳答案

这有点老套，但能完成任务。

x = ['Product A', 'Product B', 'Product C']
y1 = [20, 14, 23]
y2 = [12, 18, 29]

xcoord = [0,1,2]

annotations1 = [dict(
            x=xi-0.2,
            y=yi,
            text=str(yi),
            xanchor='auto',
            yanchor='bottom',
            showarrow=False,
        ) for xi, yi in zip(xcoord, y1)]

annotations2 = [dict(
            x=xi+0.2,
            y=yi,
            text=str(yi),
            xanchor='auto',
            yanchor='bottom',
            showarrow=False,
        ) for xi, yi in zip(xcoord, y2)]

annotations = annotations1 + annotations2