diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/constants.rst | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst index 5017159..f17e1a3 100644 --- a/Doc/library/constants.rst +++ b/Doc/library/constants.rst @@ -31,7 +31,7 @@ A small number of constants live in the built-in namespace. They are: etc.) to indicate that the operation is not implemented with respect to the other type; may be returned by the in-place binary special methods (e.g. :meth:`__imul__`, :meth:`__iand__`, etc.) for the same purpose. - Its truth value is true. + It should not be evaluated in a boolean context. .. note:: @@ -50,6 +50,11 @@ A small number of constants live in the built-in namespace. They are: even though they have similar names and purposes. See :exc:`NotImplementedError` for details on when to use it. + .. versionchanged:: 3.9 + Evaluating ``NotImplemented`` in a boolean context is deprecated. While + it currently evaluates as true, it will emit a :exc:`DeprecationWarning`. + It will raise a :exc:`TypeError` in a future version of Python. + .. index:: single: ...; ellipsis literal .. data:: Ellipsis |