python读写json、格式化写入json文件实现方式

JSON数组   ↔ Python列表（list）
JSON对象  ↔ Python字典（dict）

import json

test_dict = {'one': 1, 'two': {2.1: ['a', 'b']}}
json_str = json.dumps(test_dict)  # 关键操作

print(f"原始类型: {type(test_dict)}")  # <class 'dict'>
print(f"转换后类型: {type(json_str)}")  # <class 'str'>
print(f"JSON字符串: {json_str}")      # {"one": 1, "two": {"2.1": ["a", "b"]}}

new_dict = json.loads(json_str)  # 解析JSON字符串

print(f"解析后类型: {type(new_dict)}")  # <class 'dict'>
print(f"内容: {new_dict}")             # {'one': 1, 'two': {'2.1': ['a', 'b']}}

with open("record.json", "w") as f:
    json.dump(new_dict, f)  # 写入文件
    print("JSON文件写入完成")

{"one": 1, "two": {"2.1": ["a", "b"]}}

with open("record.json", "r") as load_f:
    load_dict = json.load(load_f)  # 从文件加载

print(f"文件解析类型: {type(load_dict)}")  # <class 'dict'>
print(f"内容: {load_dict}")               # {'one': 1, 'two': {'2.1': ['a', 'b']}}

# 方法1：dumps() + 手动写入
with open("format_json.json", "w") as f:
    f.write(json.dumps(load_dict, indent=4, ensure_ascii=False))

# 方法2：直接使用dump()参数
with open("format_json.json", "w") as f:
    json.dump(load_dict, f, indent=4, ensure_ascii=False)

{
    "one": 1,
    "two": {
        "2.1": [
            "a",
            "b"
        ]
    }
}

# 写入推荐
json.dump(data, file, indent=2, ensure_ascii=False) 

# 读取推荐
with open("data.json") as f:
    data = json.load(f)