type =" instance"而不是“dict” [英] type = "instance" instead of "dict"
问题描述
我正在尝试实现一个bookmark-url程序，该程序接受用户
输入并将字符串放入字典中。不知怎的，我不能用
迭代类型为Dict的myDictionary {}
当我写print type（myDictionary）时，我得到的类型是
" instance"，这对我没有意义。这是什么意思？
谢谢
I''m trying to implement a bookmark-url program, which accepts user
input and puts the strings in a dictionary. Somehow I''m not able to
iterate myDictionary of type Dict{}
When I write print type(myDictionary) I get that the type is
"instance", which makes no sense to me. What does that mean?
Thanks
推荐答案
Cruella DeVille写道：
Cruella DeVille wrote:
我正在尝试实现一个bookmark-url程序，该程序接受用户
输入并将字符串放入字典中。不知怎的，我无法重复我的Dict类型的词典{}
当我写print type（myDictionary）时，我得到的类型是
" instance"，这对我没有意义。这是什么意思？
I''m trying to implement a bookmark-url program, which accepts user
input and puts the strings in a dictionary. Somehow I''m not able to
iterate myDictionary of type Dict{}
When I write print type(myDictionary) I get that the type is
"instance", which makes no sense to me. What does that mean?
也许你有一个UserDict实例而不是内置字典？
Maybe you have an instance of UserDict instead of a built-in dict?
type（{}）
< type''dict''>来自UserDict导入UserDict
类型（UserDict（））
type({}) <type ''dict''> from UserDict import UserDict
type(UserDict())
< type''instance''>
UserDict.UserDict是不可迭代的，尽管你仍然可以在myDictionary.keys中使用
来表示k。
还有UserDict .IterableUserDict支持迭代。
我不认为在现代Python中使用UserDict有太多理由，因为
dict可以被子类化。 br />
Kent
<type ''instance''>
UserDict.UserDict is not iterable, though you can still use
for k in myDictionary.keys()
There is also UserDict.IterableUserDict which does support iteration.
I don''t think there is much reason to use UserDict in modern Python as
dict can be subclassed.
Kent
所以你说的是我的Dict类是Dict的子类，并且
用户定义的dicts不支持迭代？
我正在做的是我想将字典的内容写入
文件，并将字典（favDict）作为这样的参数发送：
favDict = Dict（）< - 我自己的课程（或不？）
＃放东西在favDict（工作正常）
fileToWrite.writeFile（favDict）#AttributeError：Di ct实例没有
属性''itervalues''
其中fileToWrite是写模式的文件指针
我可以发送吗一个字典作为参数，就像我在这里做的那样？
另一个问题：自我是什么？ - 意思是什么？我很熟悉
java和php（就像java和php一样吗？）
So what you are saying is that my class Dict is a subclass of Dict, and
user defined dicts does not support iteration?
What I''m doing is that I want to write the content of a dictionary to a
file, and send the dictionary (favDict) as a parameter like this:
favDict = Dict() <-- my own class (or not?)
# put things in favDict (works fine)
fileToWrite.writeFile(favDict) # AttributeError: Dict instance has no
attribute ''itervalues''
where fileToWrite is a filepointer in write-mode
Can I send a dictionary as a parameter the way I do here?
And another issue: what does the "self" - thing mean? I''m familiar with
java and php (is it like the java and php- this?)
Cruella DeVille写道：
Cruella DeVille wrote:
所以你说的是我的类Dict是Dict的子类，而用户定义的dicts不支持迭代？
我不知道你的课堂Dict是什么，我猜。内置的是
dict，而不是Dict。
我正在做的是我想将字典的内容写入
文件，然后发送字典（favDict）作为这样的参数：
favDict = Dict（）< - 我自己的类（或不是？）
这是实际代码还是你从内存中输入？
＃把东西放在favDict中（工作正常）
fileToWrite.writeFile（favDict）#AttributeError：Dict实例没有
属性''itervalues''
So what you are saying is that my class Dict is a subclass of Dict, and
user defined dicts does not support iteration?
I don''t know what your class Dict is, I was guessing. The built-in is
dict, not Dict.
What I''m doing is that I want to write the content of a dictionary to a
file, and send the dictionary (favDict) as a parameter like this:
favDict = Dict() <-- my own class (or not?)
Is this actual code or are you typing from memory?
# put things in favDict (works fine)
fileToWrite.writeFile(favDict) # AttributeError: Dict instance has no
attribute ''itervalues''
您使用的是哪个版本的Python？ itervalues（）在Python 2.2和
之后。
Kent
What version of Python are you using? itervalues() is in Python 2.2 and
later.
Kent
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