Why do iterators in Python raise an exception?

Question

Here's the syntax for iterators in Java (somewhat similar syntax in C#):

Iterator it = sequence.iterator();

while (it.hasNext()) {
    System.out.println(it.next());
}

Which makes sense. Here's the equivalent syntax in Python:

it = iter(sequence)
while True:
    try:
        value = it.next() 
    except StopIteration:
        break
    print(value)

I thought Exceptions were supposed to be used only in, well, exceptional circumstances.

Why does Python use exceptions to stop iteration?