gh-115937: Remove implementation details from inspect.signature() docs (#116086)

erlend-aasland · willingc · gpshead · web-flow · commit fb2e17b642fc · 2024-02-29T09:42:28.000Z
Co-authored-by: Carol Willing &lt;carolcode@willingconsulting.com&gt;
Co-authored-by: Gregory P. Smith &lt;greg@krypto.org&gt;
Co-authored-by: Jelle Zijlstra &lt;jelle.zijlstra@gmail.com&gt;
diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
@@ -665,9 +665,6 @@ 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
@@ -702,6 +699,13 @@ 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)
 
