python json取值

import json

json_str = '{"name": "Alice", "age": 30, "skills": ["Python", "Java", "C++"]}'

data = json.loads(json_str)
print(data)  # 输出: {'name': 'Alice', 'age': 30, 'skills': ['Python', 'Java', 'C++']}

name = data['name']
age = data['age']
skills = data['skills']

print(name)    # 输出: Alice
print(age)     # 输出: 30
print(skills)  # 输出: ['Python', 'Java', 'C++']

data['age'] = 31
data['skills'].append('JavaScript')

print(data)  # 输出: {'name': 'Alice', 'age': 31, 'skills': ['Python', 'Java', 'C++', 'JavaScript']}

updated_json_str = json.dumps(data)
print(updated_json_str)  # 输出: {"name": "Alice", "age": 31, "skills": ["Python", "Java", "C++", "JavaScript"]}

try:
    data = json.loads(json_str)
except json.JSONDecodeError as e:
    print(f"JSON解析错误: {e}")

name = data.get('name', '默认值')  # 如果'name'不存在，则返回'默认值'