Matt Nordhoff <[EMAIL PROTECTED]> wrote:
> Tommy Nordgren wrote:
> > class MyClass : a_base_class
> > memberlist=[]
> >
> > # Insert object in memberlist when created;
> > # note: objects won't be garbage collected until removed from memberlist.
>
> Just to say, if you wanted to go about it that way, you could avoid the
> garbage collection problem by using weakrefs:
>
> <http://docs.python.org/lib/module-weakref.html>
Eg...
from weakref import WeakKeyDictionary
class Test(object):
_instances = WeakKeyDictionary()
def __init__(self):
self._instances[self] = True
# your normal init stuff here
@classmethod
def instances(cls):
return cls._instances.keys()
print Test.instances()
a = Test()
b = Test()
print Test.instances()
del a
print Test.instances()
del b
print Test.instances()
....
Which prints
[]
[<__main__.Test object at 0xb7d4eb6c>, <__main__.Test object at 0xb7d4eb4c>]
[<__main__.Test object at 0xb7d4eb6c>]
[]
--
Nick Craig-Wood <[EMAIL PROTECTED]> -- http://www.craig-wood.com/nick
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