IBM Watson Studio Cloud上的叶绿藻膜地图声明错误

如何解决IBM Watson Studio Cloud上的叶绿藻膜地图声明错误

我正在使用以下代码链接到geojson文件，设置threshold_scale并在导入大叶草之后声明Choropleth映射：

    san_fran_hoods = r'https://cocl.us/sanfran_geojson'
    
    threshold_scale = np.linspace(df_hoods['Count'].min(),df_hoods['Count'].max(),6,dtype=int)
    
    threshold_scale = threshold_scale.tolist() # change the numpy array to a list
    threshold_scale[-1] = threshold_scale[-1] + 1 # last value of the list is greater than the maximum
    
    # let folium determine the scale.
    world_map = folium.Map(location=[37.759308,-122.438632],zoom_start=12)
    world_map.choropleth(
        geo_data = san_fran_hoods,data = df_hoods,columns=['Neighborhood','Count'],key_on='features.properties.disTRICT',threshold_scale=threshold_scale,fill_color='YlOrRd',fill_opacity=0.7,line_opacity=0.2,legend_name='Crime Rate in San Francisco')
    world_map

在使用choropleth声明运行块之前，我不会收到任何错误。

我不知道如何标记我的legend_name声明。非常感谢您的帮助。

以下是错误消息：

```
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/folium.py:415: FutureWarning: The choropleth  method has been deprecated. Instead use the new Choropleth class,which has the same arguments. See the example notebook 'GeoJSON_and_choropleth' for how to do this.
      FutureWarning
    ---------------------------------------------------------------------------
    AttributeError                            Traceback (most recent call last)
    <ipython-input-20-e01cd86924c1> in <module>
         10     fill_opacity=0.7,11     line_opacity=0.2,---> 12     legend_name='Crime Rate in San Francisco')
         13 world_map
         14 
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/folium.py in choropleth(self,*args,**kwargs)
        416         )
        417         from folium.features import Choropleth
    --> 418         self.add_child(Choropleth(*args,**kwargs))
        419 
        420     def keep_in_front(self,*args):
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in __init__(self,geo_data,data,columns,key_on,bins,fill_color,nan_fill_color,fill_opacity,nan_fill_opacity,line_color,line_weight,line_opacity,name,legend_name,overlay,control,show,topojson,smooth_factor,highlight,**kwargs)
       1249                 style_function=style_function,1250                 smooth_factor=smooth_factor,-> 1251                 highlight_function=highlight_function if highlight else None)
       1252 
       1253         self.add_child(self.geojson)
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in __init__(self,style_function,highlight_function,tooltip,embed,popup)
        456             self.convert_to_feature_collection()
        457             if self.style:
    --> 458                 self._validate_function(style_function,'style_function')
        459                 self.style_function = style_function
        460                 self.style_map = {}
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in _validate_function(self,func,name)
        521         """
        522         test_feature = self.data['features'][0]
    --> 523         if not callable(func) or not isinstance(func(test_feature),dict):
        524             raise ValueError('{} should be a function that accepts items from '
        525                              'data[\'features\'] and returns a dictionary.'
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in style_function(x)
       1223 
       1224         def style_function(x):
    -> 1225             color,opacity = color_scale_fun(x)
       1226             return {
       1227                 'weight': line_weight,/opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in color_scale_fun(x)
       1204 
       1205             def color_scale_fun(x):
    -> 1206                 key_of_x = get_by_key(x,key_on)
       1207                 if key_of_x is None:
       1208                     raise ValueError("key_on `{!r}` not found in GeoJSON.".format(key_on))
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in get_by_key(obj,key)
       1201                 return (obj.get(key,None) if len(key.split('.')) <= 1 else
       1202                         get_by_key(obj.get(key.split('.')[0],None),-> 1203                                    '.'.join(key.split('.')[1:])))
       1204 
       1205             def color_scale_fun(x):
    
    /opt/conda/envs/python-3.7-main/lib/python3.7/site-packages/folium/features.py in get_by_key(obj,key)
       1200             def get_by_key(obj,key):
       1201                 return (obj.get(key,None) if len(key.split('.')) <= 1 else
    -> 1202                         get_by_key(obj.get(key.split('.')[0],1203                                    '.'.join(key.split('.')[1:])))
       1204 
    
    AttributeError: 'nonetype' object has no attribute 'get'
```

非常感谢您的帮助。