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]
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