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Diffstat (limited to 'Doc/reference/datamodel.rst')
| -rw-r--r-- | Doc/reference/datamodel.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst index e815690865..4f9b8b0915 100644 --- a/Doc/reference/datamodel.rst +++ b/Doc/reference/datamodel.rst @@ -1817,6 +1817,15 @@ through the container; for mappings, :meth:`__iter__` should be the same as considered to be false in a Boolean context. +.. method:: object.__length_hint__(self) + + Called to implement :func:`operator.length_hint`. Should return an estimated + length for the object (which may be greater or less than the actual length). + The length must be an integer ``>=`` 0. This method is purely an + optimization and is never required for correctness. + + .. versionadded:: 3.4 + .. note:: Slicing is done exclusively with the following three methods. A call like :: |