caching property

gistfile1.py

from functools import partial

class CachingDescriptor(object):

    def __init__(self, func):
        self.cache = None
        self.func = func
        
    def __get__(self, obj, objtype):
        if self.cache is None:
           self.cache = self.func(obj)
        return self.cache

    def __del__(self, obj):
        self.cache = None

class Test(object):
    @CachingDescriptor
    def big(self):
        return ["<%s>" % ('-'*x) for x in range(100)]


   

ok... this is sensible and tested