gh-102536: Added _architecture field to sys.implementation

Doc/library/sys.rst

@@ -1122,6 +1122,13 @@ always available.
    ``cache_tag`` is set to ``None``, it indicates that module caching should
    be disabled.
 
+   *arch* The build architecture of the current interpreter is determined by the
+   platform on which it was built (independent of the current platform).
+
+   .. versionadded:: 3.14
+
+   .. availability:: Windows.
+
    :data:`sys.implementation` may contain additional attributes specific to
    the Python implementation.  These non-standard attributes must start with
    an underscore, and are not described here.  Regardless of its contents,

Lib/test/test_sys.py

@@ -1032,6 +1032,10 @@ def test_implementation(self):
         self.assertEqual(sys.implementation.name,
                          sys.implementation.name.lower())
 
+        if hasattr(sys.implementation, 'arch'):
+            self.assertIn(sys.implementation.arch,
+                          ['win32', 'amd64', 'arm32', 'arm64', ''])
+
     @test.support.cpython_only
     def test_debugmallocstats(self):
         # Test sys._debugmallocstats()

Misc/NEWS.d/next/Library/2024-09-26-14-43-32.gh-issue-102536.xLiIvi.rst

@@ -0,0 +1,2 @@
+Added ``arch`` attribute to :data:`sys.implementation`
+to describe the current system platform.

PCbuild/pythoncore.vcxproj

@@ -651,7 +651,11 @@
     <ClCompile Include="..\Python\structmember.c" />
     <ClCompile Include="..\Python\symtable.c" />
     <ClCompile Include="..\Python\sysmodule.c">
-      <PreprocessorDefinitions>VPATH="$(PyVPath)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>
+        ARCH_NAME="$(ArchName)";
+        VPATH="$(PyVPath)";
+        %(PreprocessorDefinitions)
+      </PreprocessorDefinitions>
     </ClCompile>
     <ClCompile Include="..\Python\thread.c" />
     <ClCompile Include="..\Python\traceback.c" />

Python/sysmodule.c

@@ -3358,6 +3358,18 @@ make_impl_info(PyObject *version_info)
     if (res < 0)
         goto error;
 
+#ifdef ARCH_NAME
+    value = PyUnicode_FromString(ARCH_NAME);
+    if (value == NULL) {
+        goto error;
+    }
+    res = PyDict_SetItemString(impl_info, "arch", value);
+    Py_DECREF(value);
+    if (res < 0) {
+        goto error;
+    }
+#endif
+
 #ifdef MULTIARCH
     value = PyUnicode_FromString(MULTIARCH);
     if (value == NULL)