3 Nov
2010
3 Nov
'10
2:43 p.m.
Antoine Pitrou wrote:
On Wed, 3 Nov 2010 13:26:27 +0800 Kristján Valur Jónsson kristjan@ccpgames.com wrote:
And why are there factory functions in threading.py and not classes?
I'm not sure, but it looks like a poor man's way of discouraging subclassing.
You usually use factory functions if you only define an API that can then be implemented in many ways.
With a class hierarchy you are always bound to one implementation and moving from Python to C or providing different specifically optimized implementations can become cumbersome.
ElementTree is another example that uses factory functions.
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