Error when attempting Choropleth map using Folium on Python

user_10563621 0
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I've been working on a map showing crime rate in different San Fransisco Neighbourhoods using Folium Choropleth Maps.

The geojson file I am using is: https://cocl.us/sanfran_geojson and I have saved this as 'data'

And the data I am using is from: https://cocl.us/sanfran_crime_dataset and I have saved this as 'cdata'.

My code is as follows;

cdata.rename(columns={'PdDistrict':'Neighbourhood'}, inplace=True)

neighbourhood = cdata.groupby(['Neighbourhood']).size().reset_index(name='Count')

to obtain:

  Neighbourhood     Count
0   BAYVIEW         14303
1   CENTRAL         17666
2   INGLESIDE       11594
3   MISSION         19503
4   NORTHERN        20100
5   PARK            8699
6   RICHMOND        8922
7   SOUTHERN        28445
8   TARAVAL         11325
9   TENDERLOIN      9942

Then I use:

sanfran = folium.Map(location=[37.7749, -122.4194], zoom_start = 12)
sanfran.choropleth(
    geo_data=dat,
    name='choropleth',
    data=neighbourhood,
    columns=['Neighbourhood', 'Count'],
    key_on='properties.DISTRICT',
    fill_color='YlOrRd',
    fill_opacity = 0.7,
    line_opacity=0.2,
    legend_name='Crime Rate in San Francisco')

When I run the sanfran.choropleth code, I get the following error:

C:\ProgramData\Anaconda3\lib\site-packages\folium\folium.py:432: 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

And then if i just type 'sanfran' and run the code I get:

unhashable type: 'list'

Would really appreciate some help with this, thank you!

folium choropleth dictionary python
2 Answers
user_51145060

If you want to run and create a map, you should follow the new syntax of folium. Your code should be like this:

sanfran = folium.Map(location=[37.7749, -122.4194], zoom_start=12)
folium.Choropleth(
    geo_data=dat,
    name='choropleth',
    data=neighbourhood,
    columns=['Neighbourhood', 'Count'],
    key_on='properties.DISTRICT',
    fill_color='YlOrRd',
    fill_opacity=0.7,
    line_opacity=0.2,
    legend_name='Crime Rate in San Francisco').add_to(sanfran)

sanfran.save('outfile.html')
user_43408990
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