https://pypi.python.org/pypi/zope.cachedescriptors

If we ask for the radius the first time:

>>> '%.2f' % point.radius
computing radius
'2.24'

We see that the radius function is called, but if we ask for it again:

>>> '%.2f' % point.radius
'2.24'

The function isn’t called. If we change one of the attribute the radius depends on, it will be recomputed:

>>> point.x = 2.0
>>> '%.2f' % point.radius
computing radius
'2.83'
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