“size”属性的Plotly scatter map值错误

Question

我试图为一个数据帧创建一个散点图，其中index=countries，columns=some variables（如下所示）

data= {'Ss': [14, 14, 30, 878], 'Cs': [20, 116, 321, 3883], 'Rs': [0, 0, 34, 1192]}
affs_df= pd.DataFrame(index= ['Argentina', 'Austria', 'Australia', 'United States'], data= data)

smfig = go.Figure()
col_names = affs_df.columns
for n in col_names:
    smfig.add_trace(go.Scattergeo(
        locationmode = 'country names',
        marker = dict(
            size= affs_df[n],
            line_color= 'rgb(40, 40, 40)',
            line_width= 0.5,
            sizemode= 'area'),
    name= n))

smfig.update_layout(
    title_text= 'Affiliations of publications',
    showlegend= True,
    geo= dict(
        scope= 'world',
        landcolor= 'rgb(217, 217, 217)'))

但我有个错误：

ValueError: 
    Invalid value of type 'pandas.core.series.Series' received for the 'size' property of scattergeo.marker

我将大小特性更改为size= affs_df[n].to_list()，但结果是一个空映射