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        "description": "Class properties\n================\n\n:Author:   Philipp von Weitershausen\n:Email:    philikon@philikon.de\n:License:  Zope Public License, v2.1\n\nMotivation\n----------\n\nUsing method decorators and descriptors like ``property``, we can\neasily create computed attributes:\n\n  >>> class JamesBrown(object):\n  ...     @property\n  ...     def feel(self):\n  ...         return self._feel\n\nAn attribute like this cannot be written, though.  You would have to\ndo something like this:\n\n  >>> class JamesBrown(object):\n  ...     def _getFeel(self):\n  ...         return self._feel\n  ...     def _setFeel(self, feel):\n  ...         self._feel = feel\n  ...     feel = property(_getFeel, _setFeel)\n\nThe problem with this approach is that it leaves the getter and setter\nsitting around in the class namespace.  It also lacks the compact\nspelling of a decorator solution.  To cope with that, some people like\nto write:\n\n  >>> class JamesBrown(object):\n  ...     @apply\n  ...     def feel():\n  ...         def get(self):\n  ...             return self._feel\n  ...         def set(self, feel):\n  ...             self._feel = feel\n  ...         return property(get, set)\n\nThis spelling feels rather cumbersome, apart from the fact that\n``apply`` is `going to go away`_ in Python 3000.\n\n.. _going to go away: http://www.python.org/peps/pep-3000.html#id24\n\n\nGoal\n----\n\nThere should be a way to declare a read & write property and still use\nthe compact and easy decorator spelling.  The read & write properties\nshould be as easy to use as the read-only property.  We explicitly\ndon't want that immediately called function that really just helps us\nname the attribute and create a local scope for the getter and setter.\n\n\nClass properties\n----------------\n\nClass properties let you define properties via the ``class``\nstatement.  You define a dynamic property as if you were implementing\na class.  This works like this:\n\n  >>> from classproperty import classproperty\n  >>> class JamesBrown(object):\n  ...     class feel(classproperty):\n  ...         def __get__(self):\n  ...             return self._feel\n  ...         def __set__(self, feel):\n  ...             self._feel = feel\n\n  >>> i = JamesBrown()\n  >>> i.feel\n  Traceback (most recent call last):\n  ...\n  AttributeError: 'JamesBrown' object has no attribute '_feel'\n\n  >>> i.feel = \"good\"\n  >>> i.feel\n  'good'\n\nOf course, deleters are also possible:\n\n  >>> class JamesBrown(object):\n  ...     class feel(classproperty):\n  ...         def __get__(self):\n  ...             return self._feel\n  ...         def __set__(self, feel):\n  ...             self._feel = feel\n  ...         def __delete__(self):\n  ...             del self._feel\n\n  >>> i = JamesBrown()\n  >>> i.feel = \"good\"\n  >>> del i.feel\n  >>> i.feel\n  Traceback (most recent call last):\n  ...\n  AttributeError: 'JamesBrown' object has no attribute '_feel'",
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