获取JSON字符串中key的所有值

import json

def get_values_from_json(json_str, target_key):
    values = []

    def traverse(obj):
        if isinstance(obj, dict):
            for key, value in obj.items():
                if key == target_key:
                    values.append(value)
                elif isinstance(value, (dict, list)):
                    traverse(value)
        elif isinstance(obj, list):
            for item in obj:
                traverse(item)

    json_obj = json.loads(json_str)
    traverse(json_obj)

    return values

# 示例JSON字符串
json_str = '''
{
    "name": "John",
    "age": 30,
    "address": {
        "city": "New York",
        "country": "USA"
    },
    "languages": ["Python", "JavaScript", "Java"]
}
'''

# 获取"city"键的所有值
city_values = get_values_from_json(json_str, "city")
print(city_values)  # 输出: ["New York"]

# 获取"languages"键的所有值
languages_values = get_values_from_json(json_str, "languages")
print(languages_values)  # 输出: [["Python", "JavaScript", "Java"]]