_Prevent_ dynamic attribute addition?
Mark McEahern
marklists at mceahern.com
Fri Aug 30 13:59:33 EDT 2002
[Sean 'Shaleh' Perry]
> So in other words, if you define __slots__ *ONLY* those members
> can exist.
> Keen.
Yup, further, subclasses are not restricted to the base class' slots:
class A(object):
__slots__ = ['foo']
class B(A):
pass
a = A()
b = B()
a.foo = 1
try:
a.bar = 2
except AttributeError, e:
print "What we expected:"
print e
b.foo = 1
print "This does not raise an error"
b.bar = 2
-
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