如何在Python中从JSON获取嵌套字典

{
    "person": {
        "name": "Alice",
        "age": 30,
        "address": {
            "city": "New York",
            "zipcode": "10001"
        }
    }
}

import json

# 假设json_data是上述JSON数据的字符串形式
json_data = '''
{
    "person": {
        "name": "Alice",
        "age": 30,
        "address": {
            "city": "New York",
            "zipcode": "10001"
        }
    }
}
'''

# 将JSON字符串转换为Python字典
data = json.loads(json_data)

# 获取嵌套字典中的数据
name = data['person']['name']
city = data['person']['address']['city']

print(f"Name: {name}, City: {city}")

# 使用get方法避免KeyError
city = data['person']['address'].get('city', 'Unknown City')
zipcode = data['person']['address'].get('zipcode', 'Unknown Zipcode')

print(f"City: {city}, Zipcode: {zipcode}")

try:
    city = data['person']['address']['city']
except KeyError as e:
    print(f"KeyError: {e}")
    city = 'Unknown City'