[IPython-dev] Getting InteractiveShell to clean up after itself
Robert Kern
robert.kern at gmail.com
Wed Aug 26 16:45:36 EDT 2009
On 2009-08-26 13:40 PM, Fernando Perez wrote:
> 1. While I'm all for using more weakrefs, they are a subtle tool and I
> doubt we can get away with using them everywhere for everything. I
> don't want to 'bet the farm' on that strategy, because we can easily
> find a situation where weakrefs don't work, we have way too much
> user-facing state managemnet we must accomplish robustly and weakrefs
> may not be the tool for everything we need to do.
In [11]: from enthought.traits.api import HasTraits, WeakRef
In [12]: class A(HasTraits):
....: b = WeakRef()
....:
In [14]: b = HasTraits()
In [15]: a = A(b=b)
In [16]: print a.b
<enthought.traits.has_traits.HasTraits object at 0x18a1cf0>
In [17]: del b
In [18]: print a.b
None
Just sayin'.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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