On Thursday, August 16, 2012 9:30:42 PM UTC-5, Paul Rubin wrote: > Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> writes: > > > Luckily, Python is open source. If anyone thinks that sets and dicts > > > should include more code protecting against mutation-during-iteration, > > > they are more than welcome to come up with a patch. Don't forget unit and > > > regression tests, and also a set of timing results which show that the > > > slow-down isn't excessive. > > > > It could be a debugging option, in which case even a fairly significant > > slowdown is acceptable.
Another possibility is to use the 'gc.get_referrers' mechanism to obtain the iterators. import gc a= set( ( 0, 1, 2 ) ) b= iter( a ) c= iter( a ) d= iter( a ) print( gc.get_referrers( a ) ) Output: [<set_iterator object at 0x00C0B9E0>, <set_iterator object at 0x00C0BA08>, <set_iterator object at 0x00C0BA30>, [others] ] This approach wouldn't be as time-efficient as a dedicated secondary structure, due to the other objects which refer to the set, including variable namespaces. -- http://mail.python.org/mailman/listinfo/python-list
