Update with pickle

[Leif K-Brooks]

Nicolas Fleury wrote:
> Leif K-Brooks wrote:
>> Add interfaces to your object's class for mutability rather than using 
>> a low-level hack. Something like this (untested):
> 
> Thx for your answer, but according to what I read about __slots__, this 
> feature has never been intended to be used that way either, so it's also 
> a kinda low-level hack, no?  It is still an interesting solution.

Using __slots__ is just an optimization, it isn't directly related to 
the example. This would also work:


class cls:
     def __init__(self, foo=None):
         self.foo = foo

     def set_foo(self, foo):
         self.foo = foo


foo = cls(42)
bar = foo
print bar.foo # 42
foo.set_foo(43)
print bar.foo # 43