TypeError: Object of type Polygon is not JSON serializable after Show()

Hello Everyone,

I am new to the form. It was so nice to e-meeting you here.

I have been struggled with this Polygon is not JSON serializable for couple days and hope someone may help.

The situation is that I have a shape file. I am trying to use CustoJS to call back after some filter data I select.

The logic is geopandas dataframe -> dictionary -> convert to JS by using to_json() -> apply GeoJSONDataSource

Everything seems fine until I called the show(figure) and it showed the error (TypeError: Object of type Polygon is not JSON serializable)

May I know what the reason is and how I can resolve it?

Thank you so much.

Best,

David

Below is the error message:


<details class='elided'>
<summary title='Show trimmed content'>&#183;&#183;&#183;</summary>

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-490-54a49b4db53d> in <module>()
    141 layout = column(widgetbox(select, data_table))
    142
--> 143 show(layout)

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in show(obj, browser, new, notebook_handle, notebook_url)
    135     if obj not in state.document.roots:
    136         state.document.add_root(obj)
--> 137     return _show_with_state(obj, state, browser, new, notebook_handle=notebook_handle)
    138
    139 #-----------------------------------------------------------------------------

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_with_state(obj, state, browser, new, notebook_handle)
    173
    174     if state.file or not shown:
--> 175         _show_file_with_state(obj, state, new, controller)
    176
    177     return comms_handle
/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_file_with_state(obj, state, new, controller)
    156
    157     '''
--> 158     filename = save(obj, state=state)
    159     controller.open("file://" + filename, new=NEW_PARAM[new])
    160

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in save(obj, filename, resources, title, template, state, **kwargs)
     81
     82     filename, resources, title = _get_save_args(state, filename, resources, title)
---> 83     _save_helper(obj, filename, resources, title, template)
     84     return abspath(filename)
     85

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in _save_helper(obj, filename, resources, title, template)
    143     '''
    144     from ..embed import file_html
--> 145     html = file_html(obj, resources, title=title, template=template)
    146
    147     with io.open(filename, mode="w", encoding="utf-8") as f:

/anaconda3/lib/python3.7/site-packages/bokeh/embed/standalone.py in file_html(models, resources, title, template, template_variables, theme)
    279
    280     with _ModelInDocument(models, apply_theme=theme) as doc:
--> 281         (docs_json, render_items) = standalone_docs_json_and_render_items(models)
    282         title = _title_from_models(models, title)
    283         bundle = bundle_for_objs_and_resources([doc], resources)

/anaconda3/lib/python3.7/site-packages/bokeh/embed/util.py in standalone_docs_json_and_render_items(models)
    338     docs_json = {}
    339     for doc, (docid, _) in docs.items():
--> 340         docs_json[docid] = doc.to_json()
    341
    342     render_items = []

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json(self)
    779         # this is a total hack to go via a string, needed because
    780         # our BokehJSONEncoder goes straight to a string.
--> 781         doc_json = self.to_json_string()
    782         return loads(doc_json)
    783

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json_string(self, indent)
    808         }
    809
--> 810         return serialize_json(json, indent=indent)
    811
    812     def validate(self):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in serialize_json(obj, pretty, indent, **kwargs)
    211         indent = 2
    212
--> 213     return json.dumps(obj, cls=BokehJSONEncoder, allow_nan=False, indent=indent, separators=separators, sort_keys=True, **kwargs)

/anaconda3/lib/python3.7/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/python3.7/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/python3.7/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,
/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in default(self, obj)
    133
    134         else:
--> 135             return self.transform_python_types(obj)
    136
    137 def serialize_json(obj, pretty=None, indent=None, **kwargs):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in transform_python_types(self, obj)
    100
    101         else:
--> 102             return super(BokehJSONEncoder, self).default(obj)
    103
    104     def default(self, obj):

/anaconda3/lib/python3.7/json/encoder.py in default(self, o)
    177
    178         """
--> 179         raise TypeError(f'Object of type {o.__class__.__name__} '
    180                         f'is not JSON serializable')
    181

TypeError: Object of type Polygon is not JSON serializable

I started trying to respond, but then realized that without seeing some code I’m really not sure what’s happening. If you really have GeoJSON then things should work.

Your general logic sounds correct.

Can you post some code and some sample data and we’ll see if we can figure it out?

···

On Monday, November 12, 2018 at 10:02:10 AM UTC-6, David Pu wrote:

Hello Everyone,

I am new to the form. It was so nice to e-meeting you here.

I have been struggled with this Polygon is not JSON serializable for couple days and hope someone may help.

The situation is that I have a shape file. I am trying to use CustoJS to call back after some filter data I select.

The logic is geopandas dataframe -> dictionary -> convert to JS by using to_json() -> apply GeoJSONDataSource

Everything seems fine until I called the show(figure) and it showed the error (TypeError: Object of type Polygon is not JSON serializable)

May I know what the reason is and how I can resolve it?

Thank you so much.

Best,

David

Below is the error message:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-490-54a49b4db53d> in <module>()
    141 layout = column(widgetbox(select, data_table))
    142
--> 143 show(layout)

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in show(obj, browser, new, notebook_handle, notebook_url)
    135     if obj not in state.document.roots:
    136         state.document.add_root(obj)
--> 137     return _show_with_state(obj, state, browser, new, notebook_handle=notebook_handle)
    138
    139 #-----------------------------------------------------------------------------

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_with_state(obj, state, browser, new, notebook_handle)
    173
    174     if state.file or not shown:
--> 175         _show_file_with_state(obj, state, new, controller)
    176
    177     return comms_handle
/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_file_with_state(obj, state, new, controller)
    156
    157     '''
--> 158     filename = save(obj, state=state)
    159     controller.open("file://" + filename, new=NEW_PARAM[new])
    160

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in save(obj, filename, resources, title, template, state, **kwargs)
     81
     82     filename, resources, title = _get_save_args(state, filename, resources, title)
---> 83     _save_helper(obj, filename, resources, title, template)
     84     return abspath(filename)
     85

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in _save_helper(obj, filename, resources, title, template)
    143     '''
    144     from ..embed import file_html
--> 145     html = file_html(obj, resources, title=title, template=template)
    146
    147     with io.open(filename, mode="w", encoding="utf-8") as f:

/anaconda3/lib/python3.7/site-packages/bokeh/embed/standalone.py in file_html(models, resources, title, template, template_variables, theme)
    279
    280     with _ModelInDocument(models, apply_theme=theme) as doc:
--> 281         (docs_json, render_items) = standalone_docs_json_and_render_items(models)
    282         title = _title_from_models(models, title)
    283         bundle = bundle_for_objs_and_resources([doc], resources)

/anaconda3/lib/python3.7/site-packages/bokeh/embed/util.py in standalone_docs_json_and_render_items(models)
    338     docs_json = {}
    339     for doc, (docid, _) in docs.items():
--> 340         docs_json[docid] = doc.to_json()
    341
    342     render_items = []

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json(self)
    779         # this is a total hack to go via a string, needed because
    780         # our BokehJSONEncoder goes straight to a string.
--> 781         doc_json = self.to_json_string()
    782         return loads(doc_json)
    783

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json_string(self, indent)
    808         }
    809
--> 810         return serialize_json(json, indent=indent)
    811
    812     def validate(self):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in serialize_json(obj, pretty, indent, **kwargs)
    211         indent = 2
    212
--> 213     return json.dumps(obj, cls=BokehJSONEncoder, allow_nan=False, indent=indent, separators=separators, sort_keys=True, **kwargs)

/anaconda3/lib/python3.7/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/python3.7/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/python3.7/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,
/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in default(self, obj)
    133
    134         else:
--> 135             return self.transform_python_types(obj)
    136
    137 def serialize_json(obj, pretty=None, indent=None, **kwargs):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in transform_python_types(self, obj)
    100
    101         else:
--> 102             return super(BokehJSONEncoder, self).default(obj)
    103
    104     def default(self, obj):

/anaconda3/lib/python3.7/json/encoder.py in default(self, o)
    177
    178         """
--> 179         raise TypeError(f'Object of type {o.__class__.__name__} '
    180                         f'is not JSON serializable')
    181

TypeError: Object of type Polygon is not JSON serializable

Dear Sarah,

Thank you so much for replying back. This is the code I have.

I am trying to see if I can update the 2nd callback, but I cant do it because of this error.

Thank you so much!

Best,

David

···
# reset the graph
reset_output()
# import data
data = data[~data.STUSPS.isin(['AK','AS', 'GU', 'HI', 'PR','MP', 'VI'])]
data3 = data[data.STUSPS.isin(['TX', 'UT'])]
data3_m = data3.drop(['geometry'], axis=1
)
# create filter
states = sorted(list(data2.NAME.unique()))
select = Select(title="State", options=
states)
# Get source
source = ColumnDataSource(ColumnDataSource.from_df(data3_m.loc[:]))
source2 = ColumnDataSource(ColumnDataSource.from_df(data3.loc[:]))
# create filtered source
filteredSource = ColumnDataSource(data=dict(STATEFP=[],NAME=[],ALAND=[]))
geo_filteredSource = GeoJSONDataSource(geojson=gpd.GeoDataFrame(dict(STATEFP=[],NAME=[],ALAND=[],geometry=
[])).to_json())
# start column table
columns = [TableColumn(field="STATEFP",title="STATEFP",sortable=True           ),
TableColumn(field="NAME",title="NAME",sortable=True           ),
TableColumn(field="ALAND",title="ALAND",sortable=True           ),
TableColumn(field="geometry",title="geometry",sortable=True
)]
data_table=DataTable(source=filteredSource,columns=columns, width=800
)
# <----- Call back ----->
callback = CustomJS(args=dict(source=                              source,
filteredSource=                              filteredSource,
data_table=data_table), code="""
var data = source.data;
var f = cb_obj.value;
var d2 = filteredSource.data;
d2['NAME']=[]
d2['STATEFP']=[]
d2['ALAND']=[]


for(i = 0; i < data['NAME'].length;i++){

if(data['NAME'][i]==f){

    d2['NAME'].push(data['NAME'][i])
    d2['STATEFP'].push(data['STATEFP'][i])
    d2['ALAND'].push(data['ALAND'][i])
}

}

filteredSource.change.emit()
// trigger change on datatable
data_table.change.emit()

"""
)
callback2 = CustomJS(args=dict(source=                              source2,
filteredSource=geo_filteredSource), code="""
var data = source.data;
var f = cb_obj.value;
var d2 = filteredSource.data;
d2['NAME']=[]
d2['STATEFP']=[]
d2['ALAND']=[]
d2['geometry']=[]


for(i = 0; i < data['NAME'].length;i++){

if(data['NAME'][i]==f){

    d2['NAME'].push(data['NAME'][i])
    d2['STATEFP'].push(data['STATEFP'][i])
    d2['ALAND'].push(data['ALAND'][i])
    d2['geometry'].push(data['geometry'][i])
}

}

filteredSource.change.emit()
"""
)
select.js_on_change('value', callback)
select.js_on_change('value'
, callback2)
# <----- Draw Graph ---->
# Export to geojson
geojson = data1.to_json()
# get column name for filter
color_column = 'ALAND'

# transform to geojson file
geo_source = GeoJSONDataSource(geojson=
geojson)
# create gradient color
color_mapper = LinearColorMapper(palette='Viridis256', low=min(data1[color_column]), high=max
(data1[color_column]))
# start the figure
p = figure(
title="USA"    , x_axis_location=None, y_axis_location=None    ,
plot_width=1000, plot_height=600
)
p.patches('xs', 'ys', fill_alpha=1          ,
fill_color = '#ffffff'          ,
line_color='black', line_width=0.5, source=
geo_source)
r2 = p.patches('xs', 'ys', fill_alpha=0.7          ,
fill_color={'field': color_column, 'transform'          : color_mapper},
line_color='black', line_width=0.5, source=
geo_filteredSource)
p.add_tools(HoverTool(renderers=[r2], tooltips=[("Name", "@NAME"), ("ALAND", "@ALAND"
)]))
# Add color bar to the right
color_bar = ColorBar(color_mapper=color_mapper, ticker=                     LogTicker(),
label_standoff=12, border_line_color=None, location=(0,0))
p.add_layout(color_bar, 'right'
)
layout = column(widgetbox(select), p, widetbox(data_table))
show(layout)

On Monday, November 12, 2018 at 9:51:12 PM UTC-5, Sarah Bird wrote:

I started trying to respond, but then realized that without seeing some code I’m really not sure what’s happening. If you really have GeoJSON then things should work.

Your general logic sounds correct.

Can you post some code and some sample data and we’ll see if we can figure it out?

On Monday, November 12, 2018 at 10:02:10 AM UTC-6, David Pu wrote:

Hello Everyone,

I am new to the form. It was so nice to e-meeting you here.

I have been struggled with this Polygon is not JSON serializable for couple days and hope someone may help.

The situation is that I have a shape file. I am trying to use CustoJS to call back after some filter data I select.

The logic is geopandas dataframe -> dictionary -> convert to JS by using to_json() -> apply GeoJSONDataSource

Everything seems fine until I called the show(figure) and it showed the error (TypeError: Object of type Polygon is not JSON serializable)

May I know what the reason is and how I can resolve it?

Thank you so much.

Best,

David

Below is the error message:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-490-54a49b4db53d> in <module>()
    141 layout = column(widgetbox(select, data_table))
    142
--> 143 show(layout)

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in show(obj, browser, new, notebook_handle, notebook_url)
    135     if obj not in state.document.roots:
    136         state.document.add_root(obj)
--> 137     return _show_with_state(obj, state, browser, new, notebook_handle=notebook_handle)
    138
    139 #-----------------------------------------------------------------------------

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_with_state(obj, state, browser, new, notebook_handle)
    173
    174     if state.file or not shown:
--> 175         _show_file_with_state(obj, state, new, controller)
    176
    177     return comms_handle
/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_file_with_state(obj, state, new, controller)
    156
    157     '''
--> 158     filename = save(obj, state=state)
    159     controller.open("file://" + filename, new=NEW_PARAM[new])
    160

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in save(obj, filename, resources, title, template, state, **kwargs)
     81
     82     filename, resources, title = _get_save_args(state, filename, resources, title)
---> 83     _save_helper(obj, filename, resources, title, template)
     84     return abspath(filename)
     85

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in _save_helper(obj, filename, resources, title, template)
    143     '''
    144     from ..embed import file_html
--> 145     html = file_html(obj, resources, title=title, template=template)
    146
    147     with io.open(filename, mode="w", encoding="utf-8") as f:

/anaconda3/lib/python3.7/site-packages/bokeh/embed/standalone.py in file_html(models, resources, title, template, template_variables, theme)
    279
    280     with _ModelInDocument(models, apply_theme=theme) as doc:
--> 281         (docs_json, render_items) = standalone_docs_json_and_render_items(models)
    282         title = _title_from_models(models, title)
    283         bundle = bundle_for_objs_and_resources([doc], resources)

/anaconda3/lib/python3.7/site-packages/bokeh/embed/util.py in standalone_docs_json_and_render_items(models)
    338     docs_json = {}
    339     for doc, (docid, _) in docs.items():
--> 340         docs_json[docid] = doc.to_json()
    341
    342     render_items = []

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json(self)
    779         # this is a total hack to go via a string, needed because
    780         # our BokehJSONEncoder goes straight to a string.
--> 781         doc_json = self.to_json_string()
    782         return loads(doc_json)
    783

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json_string(self, indent)
    808         }
    809
--> 810         return serialize_json(json, indent=indent)
    811
    812     def validate(self):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in serialize_json(obj, pretty, indent, **kwargs)
    211         indent = 2
    212
--> 213     return json.dumps(obj, cls=BokehJSONEncoder, allow_nan=False, indent=indent, separators=separators, sort_keys=True, **kwargs)

/anaconda3/lib/python3.7/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/python3.7/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/python3.7/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,
/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in default(self, obj)
    133
    134         else:
--> 135             return self.transform_python_types(obj)
    136
    137 def serialize_json(obj, pretty=None, indent=None, **kwargs):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in transform_python_types(self, obj)
    100
    101         else:
--> 102             return super(BokehJSONEncoder, self).default(obj)
    103
    104     def default(self, obj):

/anaconda3/lib/python3.7/json/encoder.py in default(self, o)
    177
    178         """
--> 179         raise TypeError(f'Object of type {o.__class__.__name__} '
    180                         f'is not JSON serializable')
    181

TypeError: Object of type Polygon is not JSON serializable

Hi David,

I’m sorry for the delay in responding again.

I was taking a look again during breakfastwithbokeh (https://www.twitch.tv/breakfastwithbokeh) this morning but I’m very sorry I can’t figure this out without the data file too. Can you point me to it, or a small piece of it.

Best,

Bird

···

On Monday, November 12, 2018 at 9:08:14 PM UTC-6, David Pu wrote:

Dear Sarah,

Thank you so much for replying back. This is the code I have.

I am trying to see if I can update the 2nd callback, but I cant do it because of this error.

Thank you so much!

Best,

David

# reset the graph
reset_output()
# import data
data = data[~data.STUSPS.isin(['AK','AS', 'GU', 'HI', 'PR','MP', 'VI'])]
data3 = data[data.STUSPS.isin(['TX', 'UT'])]
data3_m = data3.drop(['geometry'], axis=1
)
# create filter
states = sorted(list(data2.NAME.unique()))
select = Select(title="State", options=
states)
# Get source
source = ColumnDataSource(ColumnDataSource.from_df(data3_m.loc[:]))
source2 = ColumnDataSource(ColumnDataSource.from_df(
data3.loc[:]))
# create filtered source
filteredSource = ColumnDataSource(data=dict(STATEFP=[],NAME=[],ALAND=[]))
geo_filteredSource = GeoJSONDataSource(geojson=gpd.GeoDataFrame(dict(STATEFP=[],NAME=[],ALAND=[],geometry=[])).
to_json())
# start column table
columns = [TableColumn(field="STATEFP",title="STATEFP",sortable=True           ),
TableColumn(field="NAME",title="NAME",sortable=True           ),
TableColumn(field="ALAND",title="ALAND",sortable=True           ),
TableColumn(field="geometry",title="geometry",sortable=True)
]
data_table=DataTable(source=filteredSource,columns=columns, width=800
)
# <----- Call back ----->
callback = CustomJS(args=dict(source=sour                              ce,
filteredSource=                              filteredSource,
data_table=data_table), code="""
var data = source.data;
var f = cb_obj.value;
var d2 = filteredSource.data;
d2['NAME']=[]
d2['STATEFP']=[]
d2['ALAND']=[]


for(i = 0; i < data['NAME'].length;i++){

if(data['NAME'][i]==f){

    d2['NAME'].push(data['NAME'][i])
    d2['STATEFP'].push(data['STATEFP'][i])
    d2['ALAND'].push(data['ALAND'][i])
}

}

filteredSource.change.emit()
// trigger change on datatable
data_table.change.emit()

"""
)
callback2 = CustomJS(args=dict(source=sour                              ce2,
filteredSource=geo_filteredSource), code="""
var data = source.data;
var f = cb_obj.value;
var d2 = filteredSource.data;
d2['NAME']=[]
d2['STATEFP']=[]
d2['ALAND']=[]
d2['geometry']=[]


for(i = 0; i < data['NAME'].length;i++){

if(data['NAME'][i]==f){

    d2['NAME'].push(data['NAME'][i])
    d2['STATEFP'].push(data['STATEFP'][i])
    d2['ALAND'].push(data['ALAND'][i])
    d2['geometry'].push(data['geometry'][i])
}

}

filteredSource.change.emit()
"""
)
select.js_on_change('value', callback)
select.js_on_change('value'
, callback2)
# <----- Draw Graph ---->
# Export to geojson
geojson = data1.to_json()
# get column name for filter
color_column = 'ALAND'

# transform to geojson file
geo_source = GeoJSONDataSource(geojson=geoj
son)
# create gradient color
color_mapper = LinearColorMapper(palette='Viridis256', low=min(data1[color_column]), high=max
(data1[color_column]))
# start the figure
p = figure(
title="USA"    , x_axis_location=None, y_axis_location=None    ,
plot_width=1000, plot_height=600
)
p.patches('xs', 'ys', fill_alpha=1          ,
fill_color = '#ffffff'          ,
line_color='black', line_width=0.5, source=
geo_source)
r2 = p.patches('xs', 'ys', fill_alpha=0.7          ,
fill_color={'field': color_column, 'transform'          : color_mapper},
line_color='black', line_width=0.5, source=
geo_filteredSource)
p.add_tools(HoverTool(renderers=[r2], tooltips=[("Name", "@NAME"), ("ALAND", "@ALAND"
)]))
# Add color bar to the right
color_bar = ColorBar(color_mapper=color_mapper, ticker=                     LogTicker(),
label_standoff=12, border_line_color=None, location=(0,0))
p.add_layout(color_bar, 'right'
)
layout = column(widgetbox(select), p, widetbox(data_table))
show(layout)

On Monday, November 12, 2018 at 9:51:12 PM UTC-5, Sarah Bird wrote:

I started trying to respond, but then realized that without seeing some code I’m really not sure what’s happening. If you really have GeoJSON then things should work.

Your general logic sounds correct.

Can you post some code and some sample data and we’ll see if we can figure it out?

On Monday, November 12, 2018 at 10:02:10 AM UTC-6, David Pu wrote:

Hello Everyone,

I am new to the form. It was so nice to e-meeting you here.

I have been struggled with this Polygon is not JSON serializable for couple days and hope someone may help.

The situation is that I have a shape file. I am trying to use CustoJS to call back after some filter data I select.

The logic is geopandas dataframe -> dictionary -> convert to JS by using to_json() -> apply GeoJSONDataSource

Everything seems fine until I called the show(figure) and it showed the error (TypeError: Object of type Polygon is not JSON serializable)

May I know what the reason is and how I can resolve it?

Thank you so much.

Best,

David

Below is the error message:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-490-54a49b4db53d> in <module>()
    141 layout = column(widgetbox(select, data_table))
    142
--> 143 show(layout)

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in show(obj, browser, new, notebook_handle, notebook_url)
    135     if obj not in state.document.roots:
    136         state.document.add_root(obj)
--> 137     return _show_with_state(obj, state, browser, new, notebook_handle=notebook_handle)
    138
    139 #-----------------------------------------------------------------------------

/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_with_state(obj, state, browser, new, notebook_handle)
    173
    174     if state.file or not shown:
--> 175         _show_file_with_state(obj, state, new, controller)
    176
    177     return comms_handle
/anaconda3/lib/python3.7/site-packages/bokeh/io/showing.py in _show_file_with_state(obj, state, new, controller)
    156
    157     '''
--> 158     filename = save(obj, state=state)
    159     controller.open("file://" + filename, new=NEW_PARAM[new])
    160

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in save(obj, filename, resources, title, template, state, **kwargs)
     81
     82     filename, resources, title = _get_save_args(state, filename, resources, title)
---> 83     _save_helper(obj, filename, resources, title, template)
     84     return abspath(filename)
     85

/anaconda3/lib/python3.7/site-packages/bokeh/io/saving.py in _save_helper(obj, filename, resources, title, template)
    143     '''
    144     from ..embed import file_html
--> 145     html = file_html(obj, resources, title=title, template=template)
    146
    147     with io.open(filename, mode="w", encoding="utf-8") as f:

/anaconda3/lib/python3.7/site-packages/bokeh/embed/standalone.py in file_html(models, resources, title, template, template_variables, theme)
    279
    280     with _ModelInDocument(models, apply_theme=theme) as doc:
--> 281         (docs_json, render_items) = standalone_docs_json_and_render_items(models)
    282         title = _title_from_models(models, title)
    283         bundle = bundle_for_objs_and_resources([doc], resources)

/anaconda3/lib/python3.7/site-packages/bokeh/embed/util.py in standalone_docs_json_and_render_items(models)
    338     docs_json = {}
    339     for doc, (docid, _) in docs.items():
--> 340         docs_json[docid] = doc.to_json()
    341
    342     render_items = []

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json(self)
    779         # this is a total hack to go via a string, needed because
    780         # our BokehJSONEncoder goes straight to a string.
--> 781         doc_json = self.to_json_string()
    782         return loads(doc_json)
    783

/anaconda3/lib/python3.7/site-packages/bokeh/document/document.py in to_json_string(self, indent)
    808         }
    809
--> 810         return serialize_json(json, indent=indent)
    811
    812     def validate(self):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in serialize_json(obj, pretty, indent, **kwargs)
    211         indent = 2
    212
--> 213     return json.dumps(obj, cls=BokehJSONEncoder, allow_nan=False, indent=indent, separators=separators, sort_keys=True, **kwargs)

/anaconda3/lib/python3.7/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/python3.7/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/python3.7/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,
/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in default(self, obj)
    133
    134         else:
--> 135             return self.transform_python_types(obj)
    136
    137 def serialize_json(obj, pretty=None, indent=None, **kwargs):

/anaconda3/lib/python3.7/site-packages/bokeh/core/json_encoder.py in transform_python_types(self, obj)
    100
    101         else:
--> 102             return super(BokehJSONEncoder, self).default(obj)
    103
    104     def default(self, obj):

/anaconda3/lib/python3.7/json/encoder.py in default(self, o)
    177
    178         """
--> 179         raise TypeError(f'Object of type {o.__class__.__name__} '
    180                         f'is not JSON serializable')
    181

TypeError: Object of type Polygon is not JSON serializable