[GIS] Modifying several hundred geojson files by adding a feature / attribute

geojsonpython

I have just downloaded several hundred identically formatted geojson files. The problem is none of them have any attributes in their file structure just coordinates. I want to add the following lines at the top of every file using either python2 or python3: 

   content = {'"type": "FeatureCollection",'
      '"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },'
             '"features": ['
             '{ "type": "Feature", "properties": { "id": "%s" }, "geometry":' %i
             }

Where i is just the filename. I have tried a variety of things but nothing seems to get all the way there. There always seems to be an error with the string, the combination or the output. I would also like to add a ]} at the end but that is fairly straightforward append. Any help would be awesome. 

import json
with open('TestLayer.geojson', 'w') as geojson_file:
data = json.load(geojson_file)
# data is now a dict,
content = {'"type": "FeatureCollection",'
           '"crs": { "type": "name", "properties": { "name":  "urn:ogc:def:crs:OGC:1.3:CRS84" } },'
           '"features": ['
           '{ "type": "Feature", "properties": { "id": "%s" }, "geometry":'
           }
data = content+data
json.dump(data, geojson_file)

Best Answer

In your "code example" you seem to mix string and dict.

Though I would use bash (preferably sed), you can perfectly use pythons json module to edit geojson files.

import json
with open('file.geojson', 'w') as geojson_file:
    data = json.load(geojson_file)
    # data is now a dict,
    # you can do whatever you want with it
    json.dump(data, geojson_file)
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