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
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