bpo-37913: document that __length_hint__ can return NotImplemented (G… · python-emscripten/cpython@009ef29 · GitHub

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jdemeyer

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zooba

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bpo-37913: document that __length_hint__ can return NotImplemented (pythonGH-15383)

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Original file line number	Diff line number	Diff line change
@@ -2155,8 +2155,10 @@ through the container; for mappings, :meth:`__iter__` should be the same as
2155	2155
2156	2156	Called to implement :func:`operator.length_hint`. Should return an estimated
2157	2157	length for the object (which may be greater or less than the actual length).
2158		- The length must be an integer ``>=`` 0. This method is purely an
2159		- optimization and is never required for correctness.
	2158	+ The length must be an integer ``>=`` 0. The return value may also be
	2159	+ *NotImplemented*, which is treated the same as if the ``__length_hint__``
	2160	+ method didn't exist at all. This method is purely an optimization and is
	2161	+ never required for correctness.
2160	2162
2161	2163	.. versionadded:: 3.4
2162	2164

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