如何使用python消除json文件中的冗余

import json

with open('file.json', 'r') as f:
    data = json.load(f)

def remove_duplicates(data):
    if isinstance(data, dict):
        return {k: remove_duplicates(v) for k, v in data.items() if v is not None}
    elif isinstance(data, list):
        return [remove_duplicates(item) for item in data if item is not None]
    else:
        return data

data = remove_duplicates(data)

with open('file.json', 'w') as f:
    json.dump(data, f, indent=4)