Additional decorators implementing the descriptor interface
Additional Python decorators implementing the descriptor interface.
Like the built-in decorator, property, these classes are initialized by and wrap a function, generally within the context of a class, in order to modify its behavior.
This decorator functions much like a read-only property, with the difference that, upon access, it records its result in the instance’s object data dictionary, which reference takes precedence in look-ups, thereby replacing itself for that object:
from descriptors import cachedproperty @cachedproperty def circumference(self): return 2 * math.pi * self.radius
A read-only property for class methods:
from descriptors import classproperty @classproperty def badpi(cls): return 22 / 7
cached class property
A class property, which caches its result in the data dictionary of the class from which it was invoked, (under another name, so as not to interfere with inheritance of the property):
from descriptors import cachedclassproperty @cachedclassproperty def badpi(cls): return 22 / 7
Dickens is a Python distribution, which may be installed via easy_install or pip, e.g.:
pip install Dickens
…or, from source:
python setup.py install