List,
I've been messing with metaclasses. I thought I understood them until I ran
into this. (See code below.) I was expecting the generated class, 'Foo' to have
an 'x' class-level attribute, as forced upon it by the metaclass 'DracoMeta'
at creation. Unfortunately, it doesn't and I don't know why. I'm obviously
missing something big. I thought a metaclass created the class object,
so this should work. (But obviously doesn't.)
<!-- Begin Code -->
class DracoMeta(type):
'''Metaclass that creates a serial number as a class property.'''
def __init__(self, name, bases, members):
# Force a class attribute on the class-to-be:
members['serial'] = 3
# Now make the class:
type.__init__(self, name, bases, members)
class Foo(object):
__metaclass__ = DracoMeta
print hasattr(Foo, 'serial') #<-- I was really expecting this to be True.
<!-- End Code -->
I could add the attribute in the definition or a decorator, but the point was
learning to use (albeit abuse) metaclasses. Anyway, if anyone could take
a look I'd be grateful.
Thanks!
-Modulok-
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
