On Tue, Jul 31, 2012 at 1:21 PM, Terry Reedy <tjre...@udel.edu> wrote:
> Another example: KeyError and IndexError are both subscript errors, but > there is no SubscriptError superclass, even though both work thru the same > mechanism -- __getitem__. The reason is that there is no need for one. In > 'x[y]', x is usually intented to be either a sequence or mapping, but not > possibly both. In the rare cases when one wants to catch both errors, one > can easily enough. To continue the example above, popping an empty list and > empty set produce IndexError and KeyError respectively: > > try: > while True: > process(pop()) > except (KeyError, IndexError): > pass # empty collection means we are done There is a base type for KeyError and IndexError: LookupError. http://docs.python.org/library/exceptions.html#exception-hierarchy > > > -- > Terry Jan Reedy > > > > -- > http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list> >
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