Python在JSON字典中查找特定值并返回该键

import json

json_str = '{"key1": "value1", "key2": "value2", "key3": "value3"}'
json_dict = json.loads(json_str)

target_value = "value2"  # 要查找的目标值

for key, value in json_dict.items():
    if value == target_value:
        print("找到了！键为", key)
        break

target_value = "value2"  # 要查找的目标值
matching_keys = []

for key, value in json_dict.items():
    if value == target_value:
        matching_keys.append(key)

if matching_keys:
    print("找到了！键为", matching_keys)
else:
    print("未找到匹配的键")