# generator.py

from __future__ import generators
from UserList import UserList

def list_iter(data):
    print "First pass through iterator"
    i = 0
    while 1:    
        try:
            value = data[i]
            i += 1
            print "Item %s: %s" % (i, value)
            yield value
        except IndexError:
            print "Done!"
            return

class IterableUserList(UserList):
    def __iter__(self):
        return list_iter(self.data)

L = IterableUserList(['a','b','c'])
iterable = iter(L)
print "Now starting loop"
for i in iterable:
    pass