Hi all, I just ran into an interesting but rather subtle little wart today. The following expressions are not functionally equivalent, even in Python 3:
tuple(iterator.next() for i in xrange(n)) tuple([iterator.next() for i in xrange(n)]) In the first case, if iterator.next() raises a StopIteration, the exception is swallowed by the generator expression. The expression evaluates to a truncated tuple, and the StopIteration is not propagated. In the second case, the StopIteration exception is propagated as expected by the list comprehension. Set and dict comprehensions also behave this way in Python 3. Is this distinction generally known? The generator expression behavior is understandable since a generator would do the same thing, but I'm disappointed that the inconsistency exists and wasn't fixed in Python 3 when we had the chance. Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
