Python——》json、python互相转化，取值

1、JSON转Python

# json转python
j1 = '{"name": "zhangsan", "age":null}'
json_python = json.loads(j1)
print("json转python：", json_python)

运行结果：

json转python： {'name': 'zhangsan', 'age': None}

2、Python转JSON

# python转json
p1 = {"name": "zhangsan", "age": None}
python_json = json.dumps(p1)
print("python转json：", python_json)

运行结果：

python转json： {"name": "zhangsan", "age": null}

3、返回JSON对象，获取某个值

# 示例：获取返回json对象中的某一个值
students = '''[
    {"name": "张三", "age": 20, "score": 85},
    {"name": "李四", "age": 22, "score": 90},
    {"name": "王五", "age": 21, "score": 88}
]'''
"""先把JSON对象转成python"""
json_to_python = json.loads(students)
"""转换成Python后，利用列表推导式取值"""
print([i.get("name") for i in json_to_python])

运行结果：

['张三', '李四', '王五']