💰 How to dump all fields of object with __slots__ in Python - Stack Overflow

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class S(object): __slots__ = ['val'] def __init__(self, v): nodownload.ambit-trade.ru = v x = S(42) Add __slots__ = ('foo', 'bar', 'baz') to the class body, and Python will make sure that.


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As others have mentioned, the sole reason for defining __slots__ is to save some memory, when you have simple objects with a predefined set of attributes and.


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You could do something like: class Foo: __slots__ = ('a', 'b') def __init__(self, a, b​): self.a = a self.b = b def __str__(self): return str({slot.


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Use a factory function: def GetTorrentClass(slots_iterable): class Torrent(object): __slots__ = slots_iterable return Torrent. Note that in order to use slots.


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Use a factory function: def GetTorrentClass(slots_iterable): class Torrent(object): __slots__ = slots_iterable return Torrent. Note that in order to use slots.


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You could do something like: class Foo: __slots__ = ('a', 'b') def __init__(self, a, b​): self.a = a self.b = b def __str__(self): return str({slot.


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__slots__ does not (significantly) speed up attribute access: >>> class Foo(object​): __slots__ = ('spam',) def __init__(self): nodownload.ambit-trade.ru = 'eggs' >>> class.


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The problem is not unique to dataclasses. ANY conflicting class attribute will stomp all over a slot: >>> class Failure: __slots__ = tuple("xyz") x=1.


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class S(object): __slots__ = ['val'] def __init__(self, v): nodownload.ambit-trade.ru = v x = S(42) Add __slots__ = ('foo', 'bar', 'baz') to the class body, and Python will make sure that.


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When you declare instance variables using __slots__, Python creates a descriptor object as a class variable with the same name. In your case, this descriptor is.


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python __slots__ stackoverflow

But in actual usage it certainly appears as if the slot is being used- but you are correct, answer needs editing. Printing Pet. Visit chat. Current option: a setmember decorator With some effort, a so-called setmember decorator could be employed to automatically alter the class in the manner above. Until such time as the slots machinery is altered to allow more flexibility, or the language itself provides an opportunity to alter the class namespace before the class object is instantiated, our only choice is to use a metaclass. The code above takes advantage of the fact that dataclasses module gets default field values by calling getattr on the class. With dataclassy the following is possible:. Rick supports Monica Rick supports Monica 30k 8 8 gold badges 52 52 silver badges 85 85 bronze badges. I wanted to use slots because I needed to initialise many, many data class instances in another project. Active Oldest Votes. When you define both a slot and a default for an attribute, you're not actually using the slot; you remove the generated slot descriptor to replace it with the default value, so instances have space allocated for a slot that cannot be accessed. Currently, there is no opportunity other than writing a metaclass to write code that alters the class namespace before the class object is instantiated, and the slots machinery goes to work. Stack Overflow works best with JavaScript enabled.{/INSERTKEYS}{/PARAGRAPH} Specifying arguments that should go to old dataclass constructor is also possible, but in dictionary object as a first positional argument. So this:. To say the least, this is an extremely complicated endeavor. Learn more. However, the slots machinery itself could even be altered to allow for this style of code, with accommodation of the dataclasses API specifically in mind:. The dataclasses. Viewed 4k times. That's not accessing the slot. This would require deviating from the dataclasses API in order to define the default value in a location other than inside the class body, perhaps something like:. Sign up using Email and Password. The problem is not unique to dataclasses. Active 20 days ago. I ended up writing my own own alternative implementation of data classes which supports this, among a few extra features: dataclassy. New post lock available on meta sites: Policy Lock. Anonymouse Anonymouse 1 1 silver badge 11 11 bronze badges. It is read-only at that point: C. ANY conflicting class attribute will stomp all over a slot:. The class-level data 1 for x, 2 for y could just be stored on the descriptor itself for retrieval later:. This could be accommodated by importing a null-slot factory from a new slottools library:. Featured on Meta. Upcoming Events. Current option: write a metaclass Until such time as the slots machinery is altered to allow more flexibility, or the language itself provides an opportunity to alter the class namespace before the class object is instantiated, our only choice is to use a metaclass. Hot Network Questions. As noted already in the answers, data classes from dataclasses cannot generate slots for the simple reason that slots must be defined before a class is created. {PARAGRAPH}{INSERTKEYS}Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It would be easier to define the class like the following- without a default value so that the conflict doesn't occur at all- and then add a default value afterward. Such a bummer that the easiest method requires writing the init yourself, this defeating one if the biggest wins dataclasses brings to the table! The alteration is straightforward. Ask Question. Sign up or log in Sign up using Google. Even C. The Overflow Blog. Improving performance with SIMD intrinsics in three use cases. Why is it wrong to "deviate from the dataclasses API" in this case, in your opinion? Sign up using Facebook. One way of doing this might be to change the slots descriptor itself to store class level data at the time of class definition. The style of code suggested above would be a deviation from the dataclasses API. Post as a guest Name. Yes, I'd definitely agree. Beyond that, you're specifying the attribute names as strings which are easily missed by ide's. In order to prevent this conflicting variable name error, the class namespace must be altered before the class object is instantiated such that there are not two objects competing for the same member name in the class:. In fact, the PEP for data classes explicitly mentions this:. Feedback post: New moderator reinstatement and appeal process revisions. This could be changed by creating a hook for preparing the class namespace beforehand, and making it so that an error complaining about the conflicting names is only produced after that hook has been run. That's not right. This is simply how slots work. Asked 2 years, 2 months ago. Email Required, but never shown. For this case in particular, the default dataclass field values would be stored in some other convenient place so that they can be retrieved after the slot descriptor objects have been created. That's accessing the class variable you replaced the slot descriptor with. Another possibility, as mentioned above, would be for the python language to alter the slots machinery to allow more flexibility. Question feed. With some effort, a so-called setmember decorator could be employed to automatically alter the class in the manner above. You're right. It's not wrong necessarily, it's just that the API is very nice to use.