advanced-descriptors

Advanced descriptors for special cases.

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Advanced descriptors

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This package includes helpers for special cases:

SeparateClassMethod - allow to have classmethod and normal method both with the same name.
AdvancedProperty - property with possibility to set class wide getter.

SeparateClassMethod

This descriptor can be set using standard decorator syntax. Create instance with arguments:

def imeth(instance):
    return instance.value

def cmeth(owner):
    return owner.value

class Target(object):
    value = 1

    def __init__(self):
        self.value = 2
    getval = advanced_descriptors.SeparateClassMethod(
        imeth, cmeth
    )

Create instance wrapping as decorator:

class Target(object):
    value = 1

    def __init__(self):
        self.value = 2

    @advanced_descriptors.SeparateClassMethod
    def getval(self):
        return self.value

    @getval.class_method
    def getval(cls):
        return cls.value

Cases with method only and classmethod only is useless: method as-is and @classmethod should be used in corresponding cases.

AdvancedProperty

This descriptor should be used in cases, when in addition to normal property API, class getter is required. If class-wide setter and deleter also required - you should use standard propery in metaclass.

Usage examples:

In addition to normal property API:

class Target(object):
    _value = 777

    def __init__(self):
        self._value = 42

    @advanced_descriptors.AdvancedProperty
    def val(self):
        return self._value

    @val.setter
    def val(self, value):
        self._value = value

    @val.deleter
    def val(self):
        self._value = 0

    @val.cgetter
    def val(cls):
        return cls._value

Use class-wide getter for instance too:

class Target(object):
    _value = 1

    val = advanced_descriptors.AdvancedProperty()

    @val.cgetter
        def val(cls):
            return cls._value

Testing

The main test mechanism for the package advanced-descriptors is using tox. Available environments can be collected via tox -l

CI systems

For code checking several CI systems is used in parallel:

Travis CI: is used for checking: PEP8, pylint, bandit, installation possibility and unit tests. Also it’s publishes coverage on coveralls.
coveralls: is used for coverage display.

CD system

Travis CI: is used for package delivery on PyPI.

Project details

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4.0.3

Dec 16, 2022

4.0.2

Nov 2, 2021

4.0.1

Jul 1, 2021

4.0.0

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3.0.9.post0

Nov 16, 2020

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Oct 16, 2019

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Oct 16, 2019

3.0.3

Apr 29, 2019

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Apr 16, 2019

3.0.1

Feb 18, 2019

3.0.0

Dec 27, 2018

2.2.8

Apr 29, 2019

2.2.7

Feb 18, 2019

2.2.6

Feb 18, 2019

2.2.5

Jan 2, 2019

2.2.4

Dec 5, 2018

2.2.3

Nov 21, 2018

2.2.2

Nov 21, 2018

2.2.1

Oct 16, 2018

2.2.0

Oct 16, 2018

2.1.0

Oct 3, 2018

This version

2.0.0

Oct 1, 2018

1.1.2

Apr 29, 2019

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Feb 18, 2019

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0.5.4

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Dec 1, 2017

0.5.1

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advanced-descriptors 2.0.0

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AdvancedProperty

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