#
# An iterator class that does *not* use ``yield``.
#   This iterator produces every other item in a sequence.
#
class IteratorExample:
    def __init__(self, seq):
        self.seq = seq
        self.idx = 0
    def next(self):
        self.idx += 1
        if self.idx >= len(self.seq):
            raise StopIteration
        value = self.seq[self.idx]
        self.idx += 1
        return value
    def __iter__(self):
        return self
    def refresh(self):
        self.idx = 0


def test_iteratorexample():
    a = IteratorExample('edcba')
    for x in a:
        print x
    print '----------'
    a.refresh()
    for x in a:
        print x
    print '=' * 30
    a = IteratorExample('abcde')
    try:
        print a.next()
        print a.next()
        print a.next()
        print a.next()
        print a.next()
        print a.next()
    except StopIteration, e:
        print 'stopping', e