We had a bug reported that effectively boils down to we’re not swallowing exceptions when list calls __len__ (http://www.codeplex.com/WorkItem/View.aspx?ProjectName=IronPython&WorkItemId=20598).
We can obviously make the change to catch exceptions here in IronPython even if it seems like a bad idea to me ☺ But CPython seems to catch not only normal exceptions, but also SystemExit. It seems like there’s been a move away from this so I thought I’d mention it here. I tested it on 2.6.1 and 3.0. import sys class A(object): def __iter__(self): return iter(range(10)) def __len__(self): try: print('exiting') sys.exit(1) except Exception as e: print('can I catch it?', e) list(A()) which prints: exiting [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com