Python Slots Inheritance

2021年4月26日
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*Python Function Inheritance
*Python Slots Inheritance Rules
*Python Inheritance Class
*Python Inheritance Super
*Slot Machine In PythonLatest version
To have attributes named in slots to actually be stored in slots instead of a dict, a class must inherit from object. To prevent the creation of a dict, you must inherit from object and all classes in the inheritance must declare slots and none of them can have a ’dict’ entry. Continuing our consideration of slots in Python 3, we take a look at issues of inheritance and there’s also a really useful pickling tip, with or without.
*From Python documentation: slots allows us to explicitly declare data members (like properties) and deny the creation of dict and weakref (unless explicitly declared in slots or available in a parent.) So, how does it relate to the issues I’ve mentioned?
*Python 3 This is a tutorial in Python3, but this chapter of our course is available in a version for Python 2.x as well: Inheritance Example in Python 2.x. Classroom Training Courses. Due to the corona pandemic, we are currently running all courses online. Further Information!
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Decorator to add __slots__ in dataclassesPython Function InheritanceProject descriptionDecorator for adding slots
Python3.7 provides dataclasses module for faster class creation (PEP 557).Unfortunately there’s no support for __slots__. If you want to create more memory efficient instances, you need todo it by yourself or use dataslots.dataslots decorator.Python Slots Inheritance RulesUsageSimple exampleInheritance
As described in docs, in derived class __dict__ is created, because base class does not have __slots__.Slots are created from all defined properties (returned by dataclasses.fields() function).Dynamic assignment of new variablesWeakrefRead-only class variables
With __slots__ it’s possible to define read-only class variables. When using dataclasses you cannot provide typefor attribute or use typing.ClassVar to declare one.Python Inheritance ClassPickling frozen dataclass
Because of an issue 36424 you need custom __setstate__ method. In dataslots there isimplemented default version and it is used if decorated class has no __getstate__ and __setstate__ function declared.More about __slots__Release historyRelease notifications | RSS feed
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Download the file for your platform. If you’re not sure which to choose, learn more about installing packages.Files for dataslots, version 1.0.2Filename, sizeFile typePython versionUpload dateHashesFilename, size dataslots-1.0.2-py2.py3-none-any.whl (4.1 kB) File type Wheel Python version py2.py3 Upload dateHashesFilename, size dataslots-1.0.2.tar.gz (7.5 kB) File type Source Python version None Upload dateHashesCloseHashes for dataslots-1.0.2-py2.py3-none-any.whl Slot Machine In PythonHashes for dataslots-1.0.2-py2.py3-none-any.whlAlgorithmHash digestSHA2564fe302ab59c86e01a4fafe516776a198cd8a42dc696dcc9d525e2ec8ee0fe773MD5aa8075201eba64938a16361e741a901bBLAKE2-256b2b22f9f4ea849a076effa673dd9b7e67bedb9358ad0875c30cd4ae0ad6298bcCloseHashes for dataslots-1.0.2.tar.gz Hashes for dataslots-1.0.2.tar.gzAlgorithmHash digestSHA2560dfc4d12aab104b00ddb88a585c0a2227bbb9bd19c785dc8068b43eb0d6009e1MD5656b169564c8623fe9a97aa5f25df7fdBLAKE2-256a81ca45405ae05d585b786e1819a3406310a097ffd7bf5f104e7c78e63cb86a8Previous Chapter: Magic Methods and Operator Overloading
Next Chapter: Slots
Inheritance ExampleIntroduction
There aren’t many good examples on inheritance available on the web. They are either extremely simple and artificial or they are way too complicated. We want to close the gap by providing an example which is on the one hand more realistic - but still not realistic - and on the other hand simple enough to see and understand the basic aspects of inheritance. In our previous chapter, we introduced inheritance formally.
To this purpose we define two base classes: One is an implementation of a clock and the other one of a calendar. Based on these two classes, we define a class CalendarClock, which inherits both from the class Calendar and from the class Clock.The Clock ClassPrevious Chapter: Magic Methods and Operator Overloading
Next Chapter: Slots
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