Python替换嵌套JSON中的None值

import json

def replace_none(json_obj, default_value=None):
    if isinstance(json_obj, dict):
        for key, value in json_obj.items():
            if value is None:
                if default_value is not None:
                    json_obj[key] = default_value
                else:
                    del json_obj[key]
            else:
                replace_none(value, default_value)
    elif isinstance(json_obj, list):
        for item in json_obj:
            replace_none(item, default_value)

# 示例JSON数据
json_data = {
    "name": "John",
    "age": None,
    "address": {
        "street": "123 Main St",
        "city": None,
        "country": "USA"
    },
    "languages": ["Python", None, "JavaScript"]
}

# 替换None值为默认值
replace_none(json_data, "N/A")

# 打印替换后的JSON数据
print(json.dumps(json_data, indent=4))