使用ArcGIS API for Python绘制地图时，引起循环参考的原因是什么？

如何解决使用ArcGIS API for Python绘制地图时，引起循环参考的原因是什么？

在documentation（适用于Python的ArcGIS API）之后，我正在尝试从启用了空间的数据框中绘制坐标。也许我对循环引用的理解已经关闭，但是我看不到对象将如何引用自身。

import pandas as pd
from arcgis.gis import GIS
## importing geocoded data from pickle
prop_sdf = pd.read_pickle("./recent_geocoded.pkl")
prop_sdf = pd.DataFrame.spatial.from_xy(prop_sdf,'lat','long')
prop_sdf.head()

这就是我得到的数据帧的样子：

    unique_id        lat       long
0   43432884  41.701011 -70.019244
2   43400770  41.641784 -70.366659
3   43425636  41.701954 -70.146602
4   43427274  41.720506 -70.021849
5   43427818  41.649288 -70.490767

我能够渲染交互式地图

m1 = GIS().map("United States")
m1.zoom = 4
m1.center = [39,-98]

但是在绘制时遇到错误：

prop_sdf.spatial.plot(map_widget=m1)
m1

踪迹：

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-30-d48a9f223ff4> in <module>
----> 1 prop_sdf.spatial.plot(map_widget=m1)
      2 m1

~\anaconda3\lib\site-packages\arcgis\features\geo\_accessor.py in plot(self,map_widget,**kwargs)
   2002             self._data.columns = [c.replace(" ","_") for c in self._data.columns]
   2003             # plot and be merry
-> 2004             _plot_map_widget(map_widget)
   2005             self._data.columns = orig_col
   2006             return True

~\anaconda3\lib\site-packages\arcgis\features\geo\_accessor.py in _plot_map_widget(mp_wdgt)
   1984                  colors=kwargs.pop('cmap',None) or kwargs.pop('colors',None) or kwargs.pop('pallette','jet'),1985                  alpha=kwargs.pop('alpha',1),-> 1986                  **kwargs)
   1987 
   1988         # small helper to address zoom level

~\anaconda3\lib\site-packages\arcgis\features\geo\_viz\mapping.py in plot(df,name,renderer_type,symbol_type,symbol_style,col,colors,alpha,**kwargs)
    191         fc.layer['layerDeFinition']['drawingInfo']['renderer'] = renderer
    192         if map_exists:
--> 193             map_widget.add_layer(fc,options={'title':name})
    194         else:
    195             map_widget.add_layer(fc,options={'title':name})

~\anaconda3\lib\site-packages\arcgis\widgets\_mapview\_mapview.py in add_layer(self,item,options)
   1051              _is_geoenabled(item):
   1052             item = item.spatial.to_feature_collection()
-> 1053         self._add_layer_to_widget(item,options)
   1054 
   1055     def _add_layer_to_webmap(self,options):

~\anaconda3\lib\site-packages\arcgis\widgets\_mapview\_mapview.py in _add_layer_to_widget(self,options)
   1091             # (i.e.,do what was done for ImageryLayer for all major Layers)
   1092             # 'No type' layer just means that we'll figure it out at JS time
-> 1093             _lyr = _make_jsonable_dict(item._lyr_json)
   1094             if ('type' in _lyr and \
   1095                 _lyr['type'] == 'MapImageLayer') and \

~\anaconda3\lib\site-packages\arcgis\widgets\_mapview\_mapview.py in _make_jsonable_dict(obj)
     60         will later be used to delete all values with this value"""
     61         return flag
---> 62     dict_ = json.loads(json.dumps(obj,default=default_func))
     63     return { k:v for k,v in dict_.items() if v != flag }
     64 

~\anaconda3\lib\json\__init__.py in dumps(obj,skipkeys,ensure_ascii,check_circular,allow_nan,cls,indent,separators,default,sort_keys,**kw)
    236         check_circular=check_circular,allow_nan=allow_nan,indent=indent,237         separators=separators,default=default,sort_keys=sort_keys,--> 238         **kw).encode(obj)
    239 
    240 

~\anaconda3\lib\json\encoder.py in encode(self,o)
    197         # exceptions aren't as detailed.  The list call should be roughly
    198         # equivalent to the PySequence_Fast that ''.join() would do.
--> 199         chunks = self.iterencode(o,_one_shot=True)
    200         if not isinstance(chunks,(list,tuple)):
    201             chunks = list(chunks)

~\anaconda3\lib\json\encoder.py in iterencode(self,o,_one_shot)
    255                 self.key_separator,self.item_separator,self.sort_keys,256                 self.skipkeys,_one_shot)
--> 257         return _iterencode(o,0)
    258 
    259 def _make_iterencode(markers,_default,_encoder,_indent,_floatstr,ValueError: Circular reference detected