[
  {
    "type": "Feature",
    "geometry": {
      "type": "MultiPolygon"
    },
    "id": "94601"
  },
   {
    "type": "Feature",
    "geometry": {
      "type": "MultiPolygon"
    },
    "id": "94801"
  }
]

{
    "type": "FeatureCollection",
    "features":[
  {
    "type": "Feature",
    "geometry": {
      "type": "MultiPolygon"
    },
    "id": "94601"
  },
   {
    "type": "Feature",
    "geometry": {
      "type": "MultiPolygon"
    },
    "id": "94801"
  }
]
}

import json
f = open('/Users/Downloads/out_ca_california_zip_codes_geo.json', 'r')
out_file = open("/Users/Downloads/outNew_ca_california_zip_codes_geo.json", "w")
out_file.write(json.dumps(myFinalResult))