尝试合并嵌套列表中重复键的值

[
    {"key": "A", "value": 1},
    {"key": "B", "value": 2},
    {"key": "A", "value": 3},
    {"key": "C", "value": 4},
    {"key": "B", "value": 5}
]

[
    {"key": "A", "value": [1, 3]},
    {"key": "B", "value": [2, 5]},
    {"key": "C", "value": 4}
]

def merge_nested_list(nested_list):
    result_dict = {}
    
    for item in nested_list:
        key = item["key"]
        value = item["value"]
        
        if key not in result_dict:
            result_dict[key] = value
        else:
            if isinstance(result_dict[key], list):
                result_dict[key].append(value)
            else:
                result_dict[key] = [result_dict[key], value]
    
    result_list = [{"key": key, "value": value} for key, value in result_dict.items()]
    return result_list