在另一则帖子（Folium Choropleth + GeoJSON raises AttributeError: 'NoneType'）中发现有人遇到相同的问题。按照那里的建议，但我的问题仍然存在。
我已经仔细检查过： a）访问参数正确 b）geoJSON中所有可用的键都包含在Choropleth的Pandas DataFrame中。
这里是相关的代码块：
import json
# load geojson file into dic
with open('chicago.geojson') as f:
data = json.load(f)
f.close()
found=0
notfound=0
# check if the features.properties.community data matches the dataframe data
for feature in data['features']:
if feature['properties']['community'] in df_cname['COMMUNITY_AREA_NAME'].tolist():
found=found+1
else:
notfound=notfound+1
# print out the check result (and the output shows that all features.properties.community in geojson are found in the dataframe to be used for choropleth drawing.)
print(found,' records found. ', notfound, ' records not found.')
chicago_geo='chicago.geojson'
latitude = 41.88425
longitude = -87.63245
map_chicago = folium.Map(location=[latitude, longitude], zoom_start=11)
map_chicago.choropleth(
geo_data=chicago_geo,
data=df_cname,
columns=['COMMUNITY_AREA_NAME', 'COUNT'],
key_on='features.properties.community',
fill_color='YlOrRd',
fill_opacity=0.7,
line_opacity=0.2,
legend_name='Crime Data in Chicago'
)
map_chicago
以及输出/错误消息：
77 records found. 0 records not found.
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/IPython/core/formatters.py in __call__(self, obj)
334 method = get_real_method(obj, self.print_method)
335 if method is not None:
--> 336 return method()
337 return None
338 else:
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/map.py in _repr_html_(self, **kwargs)
249 self._parent = None
250 else:
--> 251 out = self._parent._repr_html_(**kwargs)
252 return out
253
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/branca/element.py in _repr_html_(self, **kwargs)
326
327 """
--> 328 html = self.render(**kwargs)
329 html = "data:text/html;charset=utf-8;base64," + base64.b64encode(html.encode('utf8')).decode('utf8') # noqa
330
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/branca/element.py in render(self, **kwargs)
319 """Renders the HTML representation of the element."""
320 for name, child in self._children.items():
--> 321 child.render(**kwargs)
322 return self._template.render(this=self, kwargs=kwargs)
323
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/map.py in render(self, **kwargs)
336 '</style>'), name='map_style')
337
--> 338 super(LegacyMap, self).render(**kwargs)
339
340
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/branca/element.py in render(self, **kwargs)
631
632 for name, element in self._children.items():
--> 633 element.render(**kwargs)
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/branca/element.py in render(self, **kwargs)
627 script = self._template.module.__dict__.get('script', None)
628 if script is not None:
--> 629 figure.script.add_child(Element(script(self, kwargs)),
630 name=self.get_name())
631
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/jinja2/runtime.py in __call__(self, *args, **kwargs)
547 (self.name, len(self.arguments)))
548
--> 549 return self._invoke(arguments, autoescape)
550
551 def _invoke(self, arguments, autoescape):
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/jinja2/runtime.py in _invoke(self, arguments, autoescape)
551 def _invoke(self, arguments, autoescape):
552 """This method is being swapped out by the async implementation."""
--> 553 rv = self._func(*arguments)
554 if autoescape:
555 rv = Markup(rv)
<template> in macro(l_1_this, l_1_kwargs)
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/jinja2/runtime.py in call(_Context__self, _Context__obj, *args, **kwargs)
258 args = (__self.environment,) + args
259 try:
--> 260 return __obj(*args, **kwargs)
261 except StopIteration:
262 return __self.environment.undefined('value was undefined because '
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/features.py in style_data(self)
563
564 for feature in self.data['features']:
--> 565 feature.setdefault('properties', {}).setdefault('style', {}).update(self.style_function(feature)) # noqa
566 feature.setdefault('properties', {}).setdefault('highlight', {}).update(self.highlight_function(feature)) # noqa
567 return json.dumps(self.data, sort_keys=True)
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/folium.py in style_function(x)
303 'color': line_color,
304 'fillOpacity': fill_opacity,
--> 305 'fillColor': color_scale_fun(x)
306 }
307
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/folium.py in color_scale_fun(x)
290 def color_scale_fun(x):
291 return color_range[len(
--> 292 [u for u in color_domain if
293 get_by_key(x, key_on) in color_data and
294 u <= color_data[get_by_key(x, key_on)]])]
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/folium.py in <listcomp>(.0)
291 return color_range[len(
292 [u for u in color_domain if
--> 293 get_by_key(x, key_on) in color_data and
294 u <= color_data[get_by_key(x, key_on)]])]
295 else:
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/folium.py in get_by_key(obj, key)
286 return (obj.get(key, None) if len(key.split('.')) <= 1 else
287 get_by_key(obj.get(key.split('.')[0], None),
--> 288 '.'.join(key.split('.')[1:])))
289
290 def color_scale_fun(x):
/opt/conda/envs/DSX-Python35/lib/python3.5/site-packages/folium/folium.py in get_by_key(obj, key)
285 def get_by_key(obj, key):
286 return (obj.get(key, None) if len(key.split('.')) <= 1 else
--> 287 get_by_key(obj.get(key.split('.')[0], None),
288 '.'.join(key.split('.')[1:])))
289
AttributeError: 'NoneType' object has no attribute 'get'
欢迎您提出建议！