如何在函数中连接作为参数传递的索引

def connect_index(index):
    if isinstance(index, int):
        # 处理整数索引
        arr = [1, 2, 3, 4, 5]
        if index >= 0 and index < len(arr):
            return arr[index]
        else:
            return "索引超出范围"
    elif isinstance(index, str):
        # 处理字符串索引
        dict = {"key1": "value1", "key2": "value2", "key3": "value3"}
        if index in dict:
            return dict[index]
        else:
            return "索引不存在"
    else:
        return "不支持的索引类型"

# 示例调用
print(connect_index(2))  # 输出：3
print(connect_index("key2"))  # 输出：value2
print(connect_index(5))  # 输出：索引超出范围
print(connect_index("key4"))  # 输出：索引不存在