import collections

class MyIterator(collections.Iterator):
  __slots__=['__i']
  def __init__(self,i):
    self.__i=i
  def __next__(self):
    return self.__i.next()
  

class MyIterable(collections.Iterable):
  __slots__=['__s']
  def __init__(self,items=None):
    if items is None:
      items=[]
    self.__s=list(items)
  def __iter__(self):
    return MyIterator(iter(self.__s))
  def __repr__(self):
    return "MyIterable(%s)" % repr(self.__s)

a=MyIterable([5,43,2,1])
print a

# Because collections.Iterator in not an iterator
# in Python 2.6 (missing next() method) 
# we have exception here
for x in a:
  print ">",x