[issue33939] Raise TypeError in __length_hint__ for consistently infinite iterators
Nick Coghlan
report at bugs.python.org
Fri Jun 22 09:25:45 EDT 2018
Nick Coghlan <ncoghlan at gmail.com> added the comment:
OverflowError covers cases like greater-than-sys.maxsize range instances, where the object itself is conceptually finite, but the length can't be represented as a C integer.
This case is different: it's a category error where the question being asked doesn't even make sense for the affected type.
However, unlike len(), where a missing __len__() implementation inherently raises TypeError, backwards compatibility requires operator.length_hint() to handle a missing implementation __length_hint__ implementation as equivalent to an implementation that returns a length hint of 0.
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<https://bugs.python.org/issue33939>
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