You should really learn about metaclasses. The basically allow you to change
the way classes are created. Normally this is done by type. I.e. the
following are equivalent.
sage: class Foo(object):
....: def a(self):
....: return 1
....:
sage: f=Foo()
sage: f.a()
1
sage: Foo=type('Foo',(object,),{'a':lambda self: 1})
sage: f=Foo()
sage: f.a()
1
I found the video talk at
http://code.google.com/edu/languages/#_python_understanding very usefull
for understanding metaclasses
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