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# this class implements an iterator
# python needs to be told when to stop iterating, this is done by raising StopIteration exception
class ReverseString():
def __init__(self, data):
self.data = data
self.index = len(data)
def __iter__(self):
return self
def __next__(self):
if self.index == 0:
raise StopIteration
self.index -= 1
return self.data[self.index]
def main():
foo = ReverseString('foobar')
for c in foo:
print(c)
if __name__ == "__main__":
main()
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