https://hg.python.org/cpython/rev/8c9a86aa222e changeset: 106329:8c9a86aa222e branch: 3.5 parent: 106320:91b949dc1984 user: Martin Panter <vadmium+py@gmail.com> date: Sun Jan 29 10:00:23 2017 +0000 summary: Issue #12067: Recommend that hash and equality be consistent files: Doc/reference/expressions.rst | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -1255,6 +1255,10 @@ sequences, but not to sets or mappings). See also the :func:`~functools.total_ordering` decorator. +* The :func:`hash` result should be consistent with equality. + Objects that are equal should either have the same hash value, + or be marked as unhashable. + Python does not enforce these consistency rules. In fact, the not-a-number values are an example for not following these rules. -- Repository URL: https://hg.python.org/cpython