Get all the instances of one class

[Terry]

On May 17, 8:04 am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Fri, 16 May 2008 20:44:00 -0300, Terry <terry.yin... at gmail.com>
> escribió:
>
> > Is there a simple way to get all the instances of one class? I mean
> > without any additional change to the class.
>
> Try with gc.get_referrers()
>
> py> import gc
> py> class A(object): pass
> ...
> py> a,b,c = A(),A(),A()
> py> A
> <class __main__.A at 0x00A3F4E0>
> py> for item in gc.get_referrers(A): print type(item)
> ...
> <type 'getset_descriptor'>
> <type 'getset_descriptor'>
> <type 'tuple'>
> <class '__main__.A'>
> <class '__main__.A'>
> <class '__main__.A'>
> <type 'dict'>
> <type 'dict'>
>
> We need to filter that list, keeping only A's instances:
>
> py> [item for item in gc.get_referrers(A) if isinstance(item,A)]
> [<__main__.A object at 0x00A40DC8>, <__main__.A object at 0x00A40DF0>,
> <__main__.A object at 0x00A40E18>]
>
> --
> Gabriel Genellina

But I saw in the help that we should "Avoid using get_referrers() for
any purpose other than debugging. "