如何在python中选择json数据中的特定字段

import json

data = '{"name": "John", "age": 30, "city": "New York"}'
parsed_data = json.loads(data)

name = parsed_data["name"]
age = parsed_data["age"]

import json

data = '[{"name": "John", "age": 30, "city": "New York"}, {"name": "Alice", "age": 25, "city": "London"}]'
parsed_data = json.loads(data)

names = [item["name"] for item in parsed_data]
ages = [item["age"] for item in parsed_data]

import json

data = '{"name": "John", "age": 30, "city": "New York", "friends": [{"name": "Alice", "age": 25}, {"name": "Bob", "age": 28}]}'
parsed_data = json.loads(data)

def get_field(data, field):
    if isinstance(data, dict):
        if field in data:
            return data[field]
        for key, value in data.items():
            result = get_field(value, field)
            if result is not None:
                return result
    elif isinstance(data, list):
        for item in data:
            result = get_field(item, field)
            if result is not None:
                return result

name = get_field(parsed_data, "name")
age = get_field(parsed_data, "age")