memoize 1.0.0

Only compute the value of properties the first time they are called. The easiest way to explain it is by example.

Bad:

class Foo(object):
    def __init__(self):
        self._bar_cache = None

    @property
    def bar(self):
        if self._bar_cache is None:
            self._bar_cache = 2 * 2 * 2
        return self._bar_cache

Good:

from memoize import mproperty

class Foo(object):
    @mproperty
    def bar(self):
        return 2 * 2 * 2