[3.12] gh-115937: Remove implementation details from inspect.signature() docs (GH-116086) (#116106)

miss-islington · erlend-aasland · willingc · web-flow · commit 31462d4de2ab · 2024-02-29T01:54:36.000-08:00
gh-115937: Remove implementation details from inspect.signature() docs (GH-116086) (cherry picked from commit fb2e17b) Co-authored-by: Erlend E. Aasland <erlend@python.org> Co-authored-by: Carol Willing <carolcode@willingconsulting.com> Co-authored-by: Gregory P. Smith <greg@krypto.org> Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
@@ -655,9 +655,6 @@ function.
    Accepts a wide range of Python callables, from plain functions and classes to
    :func:`functools.partial` objects.
 
-   If the passed object has a ``__signature__`` attribute, this function
-   returns it without further computations.
-
    For objects defined in modules using stringized annotations
    (``from __future__ import annotations``), :func:`signature` will
    attempt to automatically un-stringize the annotations using
@@ -692,6 +689,13 @@ function.
       Python.  For example, in CPython, some built-in functions defined in
       C provide no metadata about their arguments.
 
+   .. impl-detail::
+
+      If the passed object has a :attr:`!__signature__` attribute,
+      we may use it to create the signature.
+      The exact semantics are an implementation detail and are subject to
+      unannounced changes. Consult the source code for current semantics.
+
 
 .. class:: Signature(parameters=None, *, return_annotation=Signature.empty)
 
