On May 18, 11:35 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > Terry schrieb: > > > > > On May 17, 8:04 am, "Gabriel Genellina" <[EMAIL PROTECTED]> > > wrote: > >> En Fri, 16 May 2008 20:44:00 -0300, Terry <[EMAIL PROTECTED]> > >> 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. " > > Yes, because using it do is very resource-consuming and shouldn't be > done. Why don't you tell us what you are after here & then we might come > up with a better solution? > > Diez
I'm developing a message/state_machine based python program (I'm not using stackless, plan to move to it later). I want to collect all the state_machines (threads) and send them 'tick' message or 'quit' message. Now I'm using a static member to collect the machines, just wonderring if python already provide something like this. -- http://mail.python.org/mailman/listinfo/python-list
