尝试将字典键检索到列表中时，出现Get 'NoneType‘对象没有'extend’属性的错误消息

my_dict = {'key1': [1, 2, 3], 'key2': None}

# 检查键是否存在并且值不是None
if 'key1' in my_dict and my_dict['key1'] is not None:
    my_list = []
    my_list.extend(my_dict['key1'])
    print(my_list)
else:
    print("Key does not exist or value is None")

# 检查键是否存在并且值不是None
if 'key2' in my_dict and my_dict['key2'] is not None:
    my_list = []
    my_list.extend(my_dict['key2'])
    print(my_list)
else:
    print("Key does not exist or value is None")

[1, 2, 3]
Key does not exist or value is None