On Mon, 31 Oct 2005 05:12:11 -0800, Sam Pointon wrote: > 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'
__slots__ are NOT intended to be used to limit Python's dynamic nature. Whether you call this usage a misuse or a serendipitous side-effect is a matter of opinion. > 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. __slots__ only work with new-style classes, not classic classes. Before using __slots__, read this: http://www.python.org/doc/current/ref/slots.html Then read this recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/252158 -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
