Python - make your own class attributes iterable

# It can be useful to iterate through data contained 
# in your own custom objects. 
 
# Lets say you have your own class 
class ExampleClass(object):
    def __init__(self):
        self.objectList = []
        self.objectDict = {}
        self.maxItem = 100
        self.objectItem = "" 
    def iterateList(self):
        return self.objectList
    def addListItem(self, item):
        self.objectList.append(item)
    def addDictItem(self, item, value):
        self.objectDict[item] = value
 
 
# create an instance of the class 
# and lets use it's iterating methods 
ec = ExampleClass()
 
# add some example data 
for i in xrange(10):
    ec.addListItem(i)
    ec.addDictItem(i, str(i)+"'s value")
 
# now that we have data lets iterate 
# through the data 
for item in ec.iterateList():
    print item
 
#output: 
#    0 
#    1 
#    2 
#    3 
#    4 
#    5 
#    6 
#    7 
#    8 
#    9