Python plotly.express - 在scatter_geo中添加标签。

Question

我需要在scatter_geo vizualization中为标记添加静态标签。我添加了 text='data'但什么也没发生。

import plotly.express as px
import pandas as pd

rows=[['501-600','15','122.58333','45.36667'],
      ['till 500','4','12.5','27.5'],
      ['more 1001','41','-115.53333','38.08'],
      ]

colmns=['bins','data','longitude','latitude']
df=pd.DataFrame(data=rows, columns=colmns)
df = df.astype({"data": int})

fig=px.scatter_geo(df,lon='longitude', lat='latitude',
                      color='bins',
                      text='data',
                      opacity=0.5,size='data',
                      projection="natural earth")

fig.show()
fig.write_html('first_figure.html', auto_open=True)

Answer 1

你是一个 update_trace 离解决方案。随着 go.Scattergeo 您可以使用参数 mode 和 textposition 的方法内，而对于 plotly.express 你应该改变后。

import plotly.express as px
import pandas as pd

rows=[['501-600','15','122.58333','45.36667'],
      ['till 500','4','12.5','27.5'],
      ['more 1001','41','-115.53333','38.08'],
      ]

colmns=['bins','data','longitude','latitude']
df=pd.DataFrame(data=rows, columns=colmns)
df = df.astype({"data": int})

fig=px.scatter_geo(df,lon='longitude', lat='latitude',
                      color='bins',
                      text='data',
                      opacity=0.5,
                      size='data',
                      projection="natural earth")
# This
fig.update_traces(textposition="top center",
                  mode='markers+text')

fig.show()

** 更新**

为了避免图例中的问题，一个可能的解决方案是

import plotly.express as px
import plotly.graph_objs as go
import pandas as pd

rows=[['501-600','15','122.58333','45.36667'],
      ['till 500','4','12.5','27.5'],
      ['more 1001','41','-115.53333','38.08'],
      ]

colmns=['bins','data','longitude','latitude']
df=pd.DataFrame(data=rows, columns=colmns)
df = df.astype({"data": int})

fig=px.scatter_geo(df,lon='longitude', lat='latitude',
                      color='bins',
                      opacity=0.5,
                      size='data',
                      projection="natural earth")

fig.add_trace(go.Scattergeo(lon=df["longitude"],
              lat=df["latitude"],
              text=df["data"],
              textposition="middle center",
              mode='text',
              showlegend=False))
fig.show()