BUG: MultiIndex.isin raising TypeError on iterator elements - #99
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The validation loop added for GH#20252 / GH#26622 calls len(value) on anything is_list_like accepts, but that includes iterators, which have no __len__. Elements that are iterators used to reach MultiIndex.from_tuples, which handled them; now they raise "object of type 'list_iterator' has no len()" first. Materialize iterator elements with tuple() before the loop, so they can be length-checked and are still intact when from_tuples consumes them. Side effect: values is now always a list at that point, so an ndarray argument goes through to_object_array_tuples rather than tuples_to_object_array. 2-D ndarray arguments, which previously raised a buffer error, now behave like the equivalent list of rows. No input that previously returned a result changes. Closes #66514
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Mirror of pandas-dev/pandas#66540. Runs the pandas test suite through dagz.