Add text to the end of multiple json files

I’m very new to programming so excuse any terrible explanations. Basically I have 1000 json files all that need to have the same text added to the end. Here is an example:

This is what it looks like now:

{"properties": {
    "files": [
      {
        "uri": "image.png",
        "type": "image/png"
      }
    ],
    "category": "image",
    "creators": [
      {
        "address": "wallet address",
        "share": 100
      }
    ]
  }
}

Which I want to look like this:

 {"properties": {
    "files": [
      {
        "uri": "image.png",
        "type": "image/png"
      }
    ],
    "category": "image",
    "creators": [
      {
        "address": "wallet address",
        "share": 100
      }
    ]
  },
    "collection": {"name": "collection name"}
}

I’ve tried my best with append and update but it always tells me there is no attribute to append. I also don’t really know what I’m doing.

This will be embarrassing but here is what I tried and failed.

import json

entry= {"collection": {"name": "collection name"}}

for i in range((5)):
  a_file = open("./testjsons/" + str(i) + ".json","r")
  json_obj = json.load(a_file)
  print(json_obj)

json_obj["properties"].append(entry)
a_file = open(str(i) + ".json","w")
json.dump(json_obj,a_file,indent=4)
a_file.close() 
json.dump(a_file, f)

Error code: json_obj["properties"].append(entry)
AttributeError: ‘dict’ object has no attribute ‘append’

>Solution :

you don’t use append() to add to a dictionary. You can either assign to the key to add a single entry, or use .update() to merge dictionaries.

import json

entry= {"collection": {"name": "collection name"}}

for i in range((5)):
    with open("./testjsons/" + str(i) + ".json","r") as a_file:
        a_file = open("./testjsons/" + str(i) + ".json","r")
        json_obj = json.load(a_file)
        print(json_obj)
        
    json_obj["properties"].update(entry)
    with open(str(i) + ".json","w") as a_file:
        json.dump(json_obj,a_file,indent=4)