Classes as namespaces?
philip at semanchuk.com
Fri Mar 26 16:08:35 CET 2010
On Mar 26, 2010, at 10:49 AM, kj wrote:
> What's the word on using "classes as namespaces"? E.g.
> class _cfg(object):
> spam = 1
> jambon = 3
> huevos = 2
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.). But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces". Is there some problem that I'm
> not seeing with this technique?
I hope it's not problematic; I use it all the time.
A few differences about the way I do it:
- I respect PEP 8 for the class name (CamelCaps)
- If the attributes are supposed to be constants, I capitalize the
- I often add NONE with a value of zero so that bool(MyClass.NONE)
will evaluate to False and everything else will be True
Here's an example from my code:
""" Apodization constants """
# These constants are arbitrary and may change.
# However bool(NONE) is guaranteed to be False
NONE = 0
GAUSSIAN = 1
LORENTZIAN = 2
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