Sven Marnach added the comment: The current behaviour of islice() seems inconsistent with the rest of Python. All other functions taking start, stop and step arguments like slice(), range() and itertools.count() do accept integer-like objects. The code given as "roughly equivalent" in the documentation of islice() accepts integer-like objects, and so does regular list slicing. In fact, the __index__() method was introduced in PEP 357 specifically for slicing. In Python 2, islice() supported it as well. I think the expectation that islice() in Python 3 also supports it is entirely reasonable, and I can't see any strong arguments for breaking that assumption.
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