jfj wrote: >> To make it a bit clearer, a StopIteration raised in a generator >> expression silently terminates that generator: > > *any* exception raised from a generator, terminates the generator
Yeah, but StopIteration is the only expected exception and therefore the only one that client code (nearly) always knows to deal with: >>> def choke(): raise ValueError ... >>> list(i for i in range(10) if i < 3 or choke()) Traceback (most recent call last): File "<stdin>", line 1, in ? File "<stdin>", line 1, in <generator expression> File "<stdin>", line 1, in choke ValueError >>> [i for i in range(10) if i < 3 or choke()] Traceback (most recent call last): File "<stdin>", line 1, in ? File "<stdin>", line 1, in choke ValueError Here you can *not* tell apart list(genexp) and listcomp. (Of course, as has since been pointed out, the StopIteration is actually caught in the list constructor, so nothing magic to the example in my initial post) Peter -- http://mail.python.org/mailman/listinfo/python-list
