[ZPatterns] AttributeError _v_cache

[Steve Alexander]

Steve Spicklemire wrote:

> Yes.. in Python I'm used to something like:
> 
> class Foo
> 
> 	myFoo = None
> 
> 	def getMyFoo(self):
> 		if self.myFoo is None:
> 			self.myFoo = MyFoo()
> 
> 		return self.myFoo
> 
> Which seems pretty clear to me! 
> 
> What's the main advantage of the ComputedAttribute version? Is it just
> sytactical (i.e., it doesn't look like a method call, but rather an
> instance varible)?


With the implementation pattern you see in ZPatterns, once you've set up 
the attribute, there is no overhead on each retrieval.


--
Steve Alexander
Software Engineer
Cat-Box limited