I don't quite understand why this happens. Why doesn't b have its own
version of r? If r was just an int instead of a dict, then it would.
>>> class foo:
... r = {}
... def setn(self, n):
... self.r["f"] = n
...
>>> a = foo()
>>> a.setn(4)
>>>
>>> b = foo()
>>> b.r
{'f': 4}
thanks,
billy