使用Python解析JSON -如何访问深层元素

{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "Anytown",
        "zipcode": "12345"
    },
    "contacts": [
        {
            "type": "email",
            "value": "john@example.com"
        },
        {
            "type": "phone",
            "value": "555-1234"
        }
    ]
}

import json

# JSON字符串
json_str = '''
{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "Anytown",
        "zipcode": "12345"
    },
    "contacts": [
        {
            "type": "email",
            "value": "john@example.com"
        },
        {
            "type": "phone",
            "value": "555-1234"
        }
    ]
}
'''

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

# 访问深层元素
street = data['address']['street']
email = data['contacts'][0]['value']

print(f"Street: {street}")
print(f"Email: {email}")

try:
    street = data['address']['street']
except KeyError:
    street = "Unknown"

street = data.get('address', {}).get('street', "Unknown")

try:
    email = data['contacts'][0]['value']
except IndexError:
    email = "Unknown"

if len(data['contacts']) > 0:
    email = data['contacts'][0]['value']
else:
    email = "Unknown"