How to enumerate all objects and get they attribute?

for example:

obj1 = ClassName()
obj1.name = "name1"
obj2 = ClassName()
obj2.name = "name2"
obj3 =开发者_JAVA技巧 ClassName()
obj3.name = "name3"
obj4 = ClassName()
obj4.name = "name4"

and we have static variable that return number of objects: ClassName.counter

How i can get obj1.name, obj2.name and other, but if objects count can be dynamic(using cycle for example) ?

PS: more good if you can say me how to do that in the python, but only design will be good also.

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You can use a Factory class, that's to say an object which handles creation and storing of ClassName objects. Then you can easily access the different ClassNames within an array in Factory class (which must be a Singleton)

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Well... it's actually not recommended to do this type of staff, being a little incomprehensible and prone to bugs...however, you could do it this way:

class MyClass(object):
    names_list = []
    _name = None

    def get_name(self):
        return self._name
    def set_name(self, name):
        assert self._name is None
        self._name = name
        self.names_list.append(name)
    name = property(get_name, set_name)

obj1 = MyClass()
obj1.name = 'name1'

obj2 = MyClass()
obj2.name = 'name2'

print obj1.names_list
print len(obj1.names_list)

It works. It's ugly. Using some external factory to handle it is probably much better. If you want to store links to existing instances, some array/dictionary with weakrefs would probably be a fine solution.