从单个键具有多个值的字典中获取值的键

# 创建一个字典，键为字符串，值为列表
my_dict = {
    "key1": [1, 2, 3],
    "key2": [4, 5, 6],
    "key3": [7, 8, 9]
}

# 获取键为"key2"的值
value = my_dict["key2"]
print(value)  # 输出: [4, 5, 6]

# 获取值列表中的元素
element = value[0]
print(element)  # 输出: 4