On Mar 4, 6:31 am, [EMAIL PROTECTED] wrote:
> On Mar 3, 10:01 pm, Benjamin <[EMAIL PROTECTED]> wrote:
>
>
>
> > On Mar 3, 7:12 pm, [EMAIL PROTECTED] wrote:
>
> > > What are metaclasses?
>
> > Depends on whether you want to be confused or not. If you do, look at
> > this old but still head bursting
> > essay:http://www.python.org/doc/essays/metaclasses/.
>
> > Basically, the metaclass of a (new-style) class is responsible for
> > creating the class. This means when Python sees
> > class Foo(object):
> > __metaclass__ = FooMeta
> > class FooMeta(type):
> > def __new__(cls, name, bases, dct):
> > #do something cool to the class
> > pass
> > It asks FooMeta to create the class Foo. Metaclasses always extend
> > type because type is the default metaclass.
>
> But you can stack class decorations, but not class metas.
>
> @somethingcool1
> @somethingcool2
> class Foo:
> pass
>
> * class Foo:
> __metaclass__= MetaCool1, MetaCool
>
> * denotes malformed
-----------------------
class Meta1(type):
def foo1(cls):
print 'hello'
class Meta2(type):
def foo2(cls):
print 'castiron'
class Meta(Meta1, Meta2):
pass
class Base(object):
__metaclass__ = Meta
Base.foo1()
Base.foo2()
-----------------------
Gerard
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