Import upstream CPython branch '3.14'

Summary:
Imported Python `3.14.0rc3+` from upstream rev [`1ffd62baca5b60a85f5de49dd4265ea73f9f165b`](https://www.github.com/python/cpython/commit/1ffd62baca5b60a85f5de49dd4265ea73f9f165b) (committed 2025-10-05 08:53:23+00:00).

# Commit Info

Base: (`3.14.0rc3+`) - [`e7ee62b5c872dace02abbb45107033030cb0dbf0`](https://www.github.com/python/cpython/commit/e7ee62b5c872dace02abbb45107033030cb0dbf0) (commit date: 2025-10-03 20:46:29+00:00)
Imported: (`3.14.0rc3+`) - [`1ffd62baca5b60a85f5de49dd4265ea73f9f165b`](https://www.github.com/python/cpython/commit/1ffd62baca5b60a85f5de49dd4265ea73f9f165b) (commit date: 2025-10-05 08:53:23+00:00)

# Files added

```
Misc/NEWS.d/next/Windows/2025-10-04-12-18-45.gh-issue-139573.EO9kVB.rst
```

Reviewed By: itamaro

Differential Revision: D83928749

fbshipit-source-id: 205cd04832e54000f37f4a835228f5a6089717d8

Author: generatedunixname1734921407115435

.github/workflows/build.yml

@@ -320,7 +320,7 @@ jobs:
         # Keep 1.1.1w in our list despite it being upstream EOL and otherwise
         # unsupported as it most resembles other 1.1.1-work-a-like ssl APIs
         # supported by important vendors such as AWS-LC.
-        openssl_ver: [1.1.1w, 3.0.17, 3.2.5, 3.3.4, 3.4.2, 3.5.2]
+        openssl_ver: [1.1.1w, 3.0.18, 3.2.6, 3.3.5, 3.4.3, 3.5.4]
         # See Tools/ssl/make_ssl_data.py for notes on adding a new version
     env:
       OPENSSL_VER: ${{ matrix.openssl_ver }}
@@ -410,7 +410,7 @@ jobs:
     needs: build-context
     if: needs.build-context.outputs.run-tests == 'true'
     env:
-      OPENSSL_VER: 3.0.16
+      OPENSSL_VER: 3.0.18
       PYTHONSTRICTEXTENSIONBUILD: 1
     steps:
     - uses: actions/checkout@v4
@@ -530,7 +530,7 @@ jobs:
       matrix:
         os: [ubuntu-24.04]
     env:
-      OPENSSL_VER: 3.0.16
+      OPENSSL_VER: 3.0.18
       PYTHONSTRICTEXTENSIONBUILD: 1
       ASAN_OPTIONS: detect_leaks=0:allocator_may_return_null=1:handle_segv=0
     steps:

.github/workflows/reusable-ubuntu.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ${{ inputs.os }}
     timeout-minutes: 60
     env:
-      OPENSSL_VER: 3.0.15
+      OPENSSL_VER: 3.0.18
       PYTHONSTRICTEXTENSIONBUILD: 1
       TERM: linux
     steps:

Android/android.py

@@ -184,10 +184,16 @@ def make_build_python(context):
     run(["make", "-j", str(os.cpu_count())])
 
 
+# To create new builds of these dependencies, usually all that's necessary is to
+# push a tag to the cpython-android-source-deps repository, and GitHub Actions
+# will do the rest.
+#
+# If you're a member of the Python core team, and you'd like to be able to push
+# these tags yourself, please contact Malcolm Smith or Russell Keith-Magee.
 def unpack_deps(host, prefix_dir):
     os.chdir(prefix_dir)
     deps_url = "https://github.com/beeware/cpython-android-source-deps/releases/download"
-    for name_ver in ["bzip2-1.0.8-3", "libffi-3.4.4-3", "openssl-3.0.15-4",
+    for name_ver in ["bzip2-1.0.8-3", "libffi-3.4.4-3", "openssl-3.0.18-0",
                      "sqlite-3.50.4-0", "xz-5.4.6-1", "zstd-1.5.7-1"]:
         filename = f"{name_ver}-{host}.tar.gz"
         download(f"{deps_url}/{name_ver}/{filename}")

Apple/__main__.py

@@ -312,11 +312,18 @@ def unpack_deps(
     On iOS, as a safety mechanism, any dynamic libraries will be purged from
     the unpacked dependencies.
     """
+    # To create new builds of these dependencies, usually all that's necessary
+    # is to push a tag to the cpython-apple-source-deps repository, and GitHub
+    # Actions will do the rest.
+    #
+    # If you're a member of the Python core team, and you'd like to be able to
+    # push these tags yourself, please contact Malcolm Smith or Russell
+    # Keith-Magee.
     deps_url = "https://github.com/beeware/cpython-apple-source-deps/releases/download"
     for name_ver in [
         "BZip2-1.0.8-2",
         "libFFI-3.4.7-2",
-        "OpenSSL-3.0.17-1",
+        "OpenSSL-3.0.18-1",
         "XZ-5.6.4-2",
         "mpdecimal-4.0.0-2",
         "zstd-1.5.7-1",

Doc/library/asyncio-stream.rst

@@ -316,13 +316,14 @@ StreamWriter
       If that fails, the data is queued in an internal write buffer until it can be
       sent.
 
+      The *data* buffer should be a bytes, bytearray, or C-contiguous one-dimensional
+      memoryview object.
+
       The method should be used along with the ``drain()`` method::
 
          stream.write(data)
          await stream.drain()
 
-      .. note::
-         The *data* buffer should be a C contiguous one-dimensional :term:`bytes-like object <bytes-like object>`.
 
    .. method:: writelines(data)
 

Doc/library/compression.rst

@@ -1,6 +1,8 @@
 The :mod:`!compression` package
 ===============================
 
+.. module:: compression
+
 .. versionadded:: 3.14
 
 The :mod:`!compression` package contains the canonical compression modules

Doc/library/string.templatelib.rst

@@ -24,7 +24,7 @@ Template strings
 Template strings are a mechanism for custom string processing.
 They have the full flexibility of Python's :ref:`f-strings`,
 but return a :class:`Template` instance that gives access
-to the static and interpolated (in curly braces) parts of a string
+to the static and interpolated (in curly brackets) parts of a string
 *before* they are combined.
 
 To write a t-string, use a ``'t'`` prefix instead of an ``'f'``, like so:
@@ -258,13 +258,16 @@ Types
    .. attribute:: expression
       :type: str
 
-      The text of a valid Python expression, or an empty string.
+      For interpolations created by t-string literals, :attr:`!expression`
+      is the expression text found inside the curly brackets (``{`` & ``}``),
+      including any whitespace, excluding the curly brackets themselves,
+      and ending before the first ``!``, ``:``, or ``=`` if any is present.
+      For manually created interpolations, :attr:`!expression` is the arbitrary
+      string provided when constructing the interpolation instance.
 
-      The :attr:`.expression` is the original text of the
-      interpolation's Python expression, if the interpolation was created
-      from a t-string literal. Developers creating interpolations manually
-      should either set this to an empty string or choose a suitable valid
-      Python expression.
+      We recommend using valid Python expressions or the empty string for the
+      ``expression`` field of manually created :class:`!Interpolation`
+      instances, although this is not enforced at runtime.
 
       >>> t'{1 + 2}'.interpolations[0].expression
       '1 + 2'

Doc/library/sysconfig.rst

@@ -382,22 +382,19 @@ Other functions
 
    Examples of returned values:
 
-   - linux-i586
-   - linux-alpha (?)
-   - solaris-2.6-sun4u
 
-   Windows will return one of:
+   Windows:
 
    - win-amd64 (64-bit Windows on AMD64, aka x86_64, Intel64, and EM64T)
    - win-arm64 (64-bit Windows on ARM64, aka AArch64)
    - win32 (all others - specifically, sys.platform is returned)
 
-   macOS can return:
+   POSIX based OS:
 
-   - macosx-10.6-ppc
-   - macosx-10.4-ppc64
-   - macosx-10.3-i386
-   - macosx-10.4-fat
+   - linux-x86_64
+   - macosx-15.5-arm64
+   - macosx-26.0-universal2 (macOS on Apple Silicon or Intel)
+   - android-24-arm64_v8a
 
    For other non-POSIX platforms, currently just returns :data:`sys.platform`.
 

Doc/using/configure.rst

@@ -22,7 +22,7 @@ Features and minimum versions required to build CPython:
 
 * Support for threads.
 
-* OpenSSL 1.1.1 is the minimum version and OpenSSL 3.0.16 is the recommended
+* OpenSSL 1.1.1 is the minimum version and OpenSSL 3.0.18 is the recommended
   minimum version for the :mod:`ssl` and :mod:`hashlib` extension modules.
 
 * SQLite 3.15.2 for the :mod:`sqlite3` extension module.