[Python-ideas] Allow isinstance second argument to be a set of types
Mike Graham
mikegraham at gmail.com
Thu Jul 7 21:08:54 CEST 2011
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Thu Jul 7 21:08:54 CEST 2011
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On Thu, Jul 7, 2011 at 1:43 PM, Antoine Pitrou <solipsis at pitrou.net> wrote: > On Thu, 7 Jul 2011 13:22:33 -0400 > Jim Jewett <jimjjewett at gmail.com> wrote: >> On Wed, Jul 6, 2011 at 7:35 PM, Benjamin Peterson <benjamin-+ZN9ApsXKcEdnm+yROfE0A at public.gmane.org> wrote: >> >> > class Evil(type): >> > def __iter__(self): >> > return range(42) >> >> > class Accomplice(metaclass=Evil): >> > pass >> >> ... leading to isinstance(x, 42) rather than isinstance(x, Evil) if >> the iterable check is done too soon. > > In what way is that a problem? > That you can trigger exceptions by writing malicious code doesn't sound > like a particularly novel event ;) I think people are assuming that an iterable metaclass isn't fundamentally wrong. Mike
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