how to get list of all instance in class python
import weakref
class MyClass:
_instances = set()
def __init__(self, name):
self.name = name
self._instances.add(weakref.ref(self))
@classmethod
def getinstances(cls):
dead = set()
for ref in cls._instances:
obj = ref()
if obj is not None:
yield obj
else:
dead.add(ref)
cls._instances -= dead
a = MyClass("a")
b = MyClass("b")
c = MyClass("c")
del b
for obj in MyClass.getinstances():
print obj.name # prints 'a' and 'c'