On 02/13/2014 09:57 AM, Roy Smith wrote:
In article <mailman.6850.1392313443.18130.python-l...@python.org>,
Ethan Furman <et...@stoneleaf.us> wrote:
Say you have a class that represents serial ports or your computer. You
should get the same object every time you ask
for SerialPort(2).
Why? Certainly, you should get objects which refer to the same physical
port. So:
port_a = SerialPort(2)
port_b = SerialPort(2)
port_a.enable()
assert port_b.is_shutdown() == False
port_a.shutdown()
assert port_b.is_shutdown() == True
But, why do they have to be the same object? Why should I care if
port_a is port_b
is False, as long as all operations I perform on either are reflected in
correct state changes on the other one?
You mean use the Borg pattern instead of the Singleton pattern? As far as I can tell they are two shades of the same
thing. Are there any drastic differences between the two? Besides one having many instances that share one __dict__
and the other just having one instance and one __dict__?
--
~Ethan~
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