gh-111835: Add seekable method to mmap.mmap (gh-111852)

2 files changed, 16 insertions, 0 deletions

diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index 4ca7a64..3fa69e7 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -285,6 +285,14 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
       values are ``os.SEEK_CUR`` or ``1`` (seek relative to the current
       position) and ``os.SEEK_END`` or ``2`` (seek relative to the file's end).
 
+      .. versionchanged:: 3.13
+         Return the new absolute position instead of ``None``.
+
+   .. method:: seekable()
+
+      Return whether the file supports seeking, and the return value is always ``True``.
+
+      .. versionadded:: 3.13
 
    .. method:: size()
 
diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
index 428b648..ae3c88d 100644
--- a/Doc/whatsnew/3.13.rst
+++ b/Doc/whatsnew/3.13.rst
@@ -198,6 +198,14 @@ ipaddress
 * Add the :attr:`ipaddress.IPv4Address.ipv6_mapped` property, which returns the IPv4-mapped IPv6 address.
   (Contributed by Charles Machalow in :gh:`109466`.)
 
+mmap
+----
+
+* The :class:`mmap.mmap` class now has an :meth:`~mmap.mmap.seekable` method
+  that can be used where it requires a file-like object with seekable and
+  the :meth:`~mmap.mmap.seek` method return the new absolute position.
+  (Contributed by Donghee Na and Sylvie Liberman in :gh:`111835`.)
+
 opcode
 ------