Fix path matching in CPythonTestCase/setUpClass (pytorch#153070)

Pull Request resolved: pytorch#153070
Approved by: https://github.com/amjames, https://github.com/anijain2305, https://github.com/Skylion007

Author: guilhermeleobas

torch/_dynamo/test_case.py

@@ -15,7 +15,6 @@
 import inspect
 import logging
 import os
-import pathlib
 import re
 import sys
 import unittest
@@ -178,13 +177,14 @@ def tearDownClass(cls) -> None:
     @classmethod
     def setUpClass(cls) -> None:
         # Skip test if python versions doesn't match
-        normalized_path = pathlib.PurePath("dynamo/cpython").as_posix()
-        regex = re.escape(normalized_path) + r"\b\d+_\d{2}\b"
-        m = re.search(regex, inspect.getfile(cls))
+        prefix = os.path.join("dynamo", "cpython") + os.path.sep
+        regex = re.escape(prefix) + r"\d_\d{2}"
+        search_path = inspect.getfile(cls)
+        m = re.search(regex, search_path)
         if m:
-            test_py_ver = tuple(map(int, m.group().split("_")))
+            test_py_ver = tuple(map(int, m.group().removeprefix(prefix).split("_")))
             py_ver = sys.version_info[:2]
-            if py_ver != test_py_ver:
+            if py_ver < test_py_ver:
                 expected = ".".join(map(str, test_py_ver))
                 got = ".".join(map(str, py_ver))
                 raise unittest.SkipTest(