Hi,
How can I iterate over all the objects of a class?
I wrote the code like following:
class baseClass(object):
__registry = []
def __init__(self, name):
self.__registry.append(self)
self.name = name
def __iter__(self):
baseClass.item = 0
return self.__registry[0]
def next(self):
if baseClass.item >= len(self.__registry):
raise StopIteration
baseClass.item += 1
return self.__registry[baseClass.item - 1]
For testing, create the following objects-
a = baseClass("Test1")
b = baseClass("Test2")
class subClass (baseClass):
pass
c = subClass("Test3")
---->Actual Iteration<----
for i in a:
print i.name
Test1
Test2
Test3
---------------------------------------------------
I see the following problems in the code:
1. I have to iterate over any of the objects. For correctness, I
wanted to iterate over the class, like
for i in baseClass():
do x
but that will will create one more object - which I do not want.
2. If the subclass wants to do somethings in its constructor, I am not
sure how to update the registry.
class subClass (baseClass):
def __init__(self, name):
**do something**
super.init(self, name) ----> This errors out, saying it needs
super, not subClass
Another method I thought of implementing it was using generators -
where-in baseClass.objects() is a generator which will yield the
objects one by one - but even then the second issue remains.
If somebody can help me out, I would be very thankful.
Regards
K
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