Simplify sys.abiflags in sysconfig and site

Author: XuehaiPan

Lib/sysconfig/__init__.py

@@ -506,11 +506,6 @@ def _init_config_vars():
     base_prefix = _BASE_PREFIX
     base_exec_prefix = _BASE_EXEC_PREFIX
 
-    with warnings.catch_warnings():
-        # ignore DeprecationWarning on sys.abiflags change on Windows
-        warnings.simplefilter('ignore', DeprecationWarning)
-        abiflags = getattr(sys, 'abiflags', '')
-
     if os.name == 'posix':
         _init_posix(_CONFIG_VARS)
         # If we are cross-compiling, load the prefixes from the Makefile instead.
@@ -520,6 +515,10 @@ def _init_config_vars():
             base_prefix = _CONFIG_VARS['host_prefix']
             base_exec_prefix = _CONFIG_VARS['host_exec_prefix']
             abiflags = _CONFIG_VARS['ABIFLAGS']
+        else:
+            abiflags = sys.abiflags
+    else:
+        abiflags = ''  # sys.abiflags is absent on Windows
 
     # Normalized versions of prefix and exec_prefix are handy to have;
     # in fact, these are the standard versions used most places in the

Lib/test/test_sys.py

@@ -719,6 +719,9 @@ def test_attributes(self):
         self.assertIn(sys.float_repr_style, ('short', 'legacy'))
         if not sys.platform.startswith('win'):
             self.assertIsInstance(sys.abiflags, str)
+
+            # test hasattr(sys, 'abiflags') == (os.name != 'nt)
+            self.assertEqual(os.name, 'posix')
         else:
             absent = object()
             with self.assertWarnsRegex(
@@ -743,6 +746,9 @@ def test_attributes(self):
                 ):
                     _ = sys.abiflags
 
+            # test hasattr(sys, 'abiflags') == (os.name != 'nt)
+            self.assertEqual(os.name, 'nt')
+
     def test_thread_info(self):
         info = sys.thread_info
         self.assertEqual(len(info), 3)