One alrady exists, __slots__.
>>> class Foo(object):
__slots__ = ['bar', 'baz', 'qig']
>>> f = Foo()
>>> f.foo = 'bar'
Traceback (most recent call last):
File "<pyshell#5>", line 1, in -toplevel-
f.foo = 'bar'
AttributeError: 'Foo' object has no attribute 'foo'
>>> f.bar = 'foo'
However, __slots__ only works for class instances, so if you're messing
around with uninitialised classes (not a good idea outside the
singleton pattern or very functional-style code) it won't work.
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