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Simple Python classproperty decorator

PyPI package PyPI version

This module provides a simple way for defining class properties.

Install

You can install this Python module via pip:

pip install simple-classproperty

Otherwise the module can be downloaded from PyPI: https://pypi.org/project/simple-classproperty/

Usage

  1. Import the module:
    from simple_classproperty import ClassPropertyMeta, classproperty
    
  2. Create a class with a class property:
    class NewClass(metaclass=ClassPropertyMeta):
        _attr = "val"
    
        @classproperty
        def attr(cls):
            return cls._attr
    
    Don't forget to set the metaclass!
  3. (Optional) Define also a setter and deleter for the newly created class property (this works like the standard python property):
    @attr.setter
    def attr(cls, value):
        cls._attr = value
    
    @attr.deleter
    def attr(cls):
        del cls._attr
    

Tips

The classproperty is also accessible from an instance:

instance = NewClass()
print(instance.attr)  # "val"

But when the value of the property is changed from an instance object, only the instance has this value:

instance = NewClass()
instance.attr = "new"
print(instance.attr)  # "new"
print(NewClass.attr)  # "val"

When deleting the property from the instance, the class value is used again:

instance = NewClass()
instance.attr = "new"
print(instance.attr)  # "new"

del instance.attr
print(instance.attr)  # "val"

Metadata

Release files for simple-classproperty 1.0.2

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Table of built distributions (wheels) for simple-classproperty 1.0.2
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