πŸ’ python - Create dictionary with default immutable keys - Code Review Stack Exchange

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class Foo(object): __slots__ = 'foo' foo = 1. Interpreter throws such exception: ValueError: 'foo' in __slots__ conflicts with class variable.


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ValueError: 'format' in __slots__ conflicts with class variable progressbar File "/​tmp/pip-build-qe3ebgj7/progressbar/progressbar/__init__.py".


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Slots in Python: A way to prevent the dynamical creation of attributes and to save memory The attributes of objects are stored in a dictionary "__dict__". mean a waste of space for objects, which have only a small amount of instance variables. class S(object): __slots__ = ['val'] def __init__(self, v): list.opgdota.ru = v x = S(42).


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in __slots__ conflicts with class variable I use `Generics` in classes without slots a lot, hence I think this error has to be linked to `__slots__`.


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__new__ where __slots__ are taken into account. """ is # define as local functions the and __repr__ that we'll # use in the new class def __init__(self, **kw​): warn about conflicts if k in newdict: list.opgdota.ru("Can't set attr %r in bunch-​class %r" % (k, else: # class variables, store name in # value as an item in __​dflts__.


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I've tried to declare two classes @dataclass class Base: __slots__ = ('x',) 'x' in __slots__ conflicts with class variable In the dataclasses case.


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I've tried to declare two classes @dataclass class Base: __slots__ = ('x',) 'x' in __slots__ conflicts with class variable In the dataclasses case.


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Pure python equivalent of the __slots__ implementation using descriptors and a metaclass. 'Rough approximation of how slots work' class Member(object): creates two additional class variables, x=Member(0) and y=Member(1). well as management of values by descriptors) to avoid name conflicts?


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import return a ValueError:'ciphers' in __slots__ conflicts with class variable #​. Closed. hamilton-z opened this issue on Nov 5, Β· 4 comments. Closed.


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No, you will get a ValueError with the message, "__slots__ conflicts with class variable" The reason for this is that slots are implemented as.


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And judging by the interface, it seems that it may fit. When you create a class and assign a attribute to it, you're by default assigning to this. Mapping :. Asked 3 years, 2 months ago. One was sub-classing an Abstract Base Class from the collections module and the other was actually sub-classing dict. Sign up using Facebook. It only takes a minute to sign up. This is as a default dict wants to be an exact copy of dict , it wants everything it has. Active 3 years, 2 months ago. Related 4. And in most cases, if you ignore that these exist then your code will still work fine. But, it wants to change the usage slightly, so that if a key is missing then you don't get an error. Mapping or collections. To get the same with an ABC, you'd have to add each function to the class like you did. And so ignoring the above, as it's not needed, we need to look into which is better. This is good for cases when you want something that is a mapping, but doesn't have all the attributes or functions that dict has. Featured on Meta. These are not defined for Mapping. Post as a guest Name. Active Oldest Votes. Seanny Seanny 1, 1 1 gold badge 15 15 silver badges 31 31 bronze badges. Home Questions Tags Users Unanswered. Sign up to join this community. I don't know the specifics of OP's need. Viewed 3k times. Let's update the modal for new askers. And so you'd use something like:. And so this is the best one to go with, as you do not want dict. So it's up to them to add it if they want to. And then, you can go two routes, 1. Slots defines attributes names that are reserved for the use as attributes for the instances of the class. The Overflow Blog. First, the best example for writing a subclass, is probably defaultdict. Mapping to provide the basic scaffolding for a read only dict as you've implemented all the abstract methods - and you would get a few extra things for free, e. It still has dict. Subclassing an ABC, or subclassing dict. Podcast JavaScript is ready to get its own place. Add your immutekey in the magic method. My search to do this correctly started at the StackOverflow question " How to 'perfectly' override a dict " where I discovered there were two approaches to doing this. Hot Network Questions. The justification for actually sub-classing dict confused me. To note: this is not specific to your code, this is the same with any and all classes. Showing how you could use 2 would be:. To improve your code, I'd recommend that you instead make the core Bones class a separate type. Note that with this implementation, you can still delete values, which you try to prohibit in your original implementation:. Sign up or log in Sign up using Google. Podcast New tools for new times. Say a 'limited dict', or a 'half frozen dict'. And what pros and cons come to both. Question feed.{/INSERTKEYS}{/PARAGRAPH} Sign up using Email and Password. Phrancis: A final review of a good member. The best answers are voted up and rise to the top. We're switching to CommonMark. Peilonrayz Peilonrayz There's a lot of extras that come with MutableMapping that also wouldn't work pop , update , clear , etc. Background My search to do this correctly started at the StackOverflow question " How to 'perfectly' override a dict " where I discovered there were two approaches to doing this. What posts should be escalated to staff using [status-review], and how do I…. Create dictionary with default immutable keys Ask Question. To know which is better, you have to understand what a subclass and an interface are. {PARAGRAPH}{INSERTKEYS}Code Review Stack Exchange is a question and answer site for peer programmer code reviews. Email Required, but never shown. This, without us having to code it, allows you to use DefaultDict almost exactly the same way as dict.