Append element to json dict (geojson) using Python -

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i add style geojson through python. current features not have style elements. want append style , fill. however, when do, nothing added file. same before

import json  open('test.json') f:     data = json.load(f)  feature in data['features']:     feature.append("style")     feature["style"].append({"fill":color})

sample geojson

{ "type": "featurecollection", "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:ogc:1.3:crs84" } },  "features": [ { "type": "feature", "properties": { "statefp": "17", "countyfp": "019", "tractce": "005401", "blkgrpce": "2", "geoid": "170190054012", "namelsad": "block group 2", "mtfcc": "g5030", "funcstat": "s", "aland": 574246.000000, "awater": 4116.000000, "intptlat": "+40.1238204", "intptlon": "-088.2038105", "gisjoin": "g17001900054012", "stusps": "il", "shape_area": 578361.706954, "shape_len": 3489.996273, "census_block_income_year": "2009-2013", "census_block_income_state": "illinois", "census_block_income_statea": 17, "census_block_income_county": "champaign county"}}]}

i'm trying end results be:

    { "type": "featurecollection", "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:ogc:1.3:crs84" } },  "features": [ { "type": "feature", "properties": { "statefp": "17", "countyfp": "019", "tractce": "005401", "blkgrpce": "2", "geoid": "170190054012", "namelsad": "block group 2", "mtfcc": "g5030", "funcstat": "s", "aland": 574246.000000, "awater": 4116.000000, "intptlat": "+40.1238204", "intptlon": "-088.2038105", "gisjoin": "g17001900054012", "stusps": "il", "shape_area": 578361.706954, "shape_len": 3489.996273, "census_block_income_year": "2009-2013", "census_block_income_state": "illinois", "census_block_income_statea": 17, "census_block_income_county": "champaign county"},"style"{fill:"red"}}]}

when type

for feature in data['features']:

every feature item of list data['features']. each item there dictionary, calling wrong method (append method of lists).

you write 

for feature in data['features']:     feature.update({"style": {"fill": "red"}})

finally, if want file got initial json structure altered, make sure write updated data structure file:

with open('output2.json', 'w') f:     json.dump(data, f)

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