convert bin/python3 to python.exe

Author: rickeylev

python/private/local_runtime_repo.bzl

@@ -277,10 +277,11 @@ def _find_python_exe_from_target(rctx):
         return base_path, None
     attempted_paths = [base_path]
 
-    # On Windows, python.exe is in the root, not under `bin/`, so
-    # go up a directory
-
-    path = base_path.dirname.dirname.get_child(base_path.basename)
+    # Try to convert a unix-y path to a Windows path. On Linux/Mac,
+    # the path is usually `bin/python3`. On Windows, it's simply
+    # `python.exe`.
+    basename = base_path.basename.rstrip("3")
+    path = base_path.dirname.dirname.get_child(basename)
     path = rctx.path("{}.exe".format(path))
     if path.exists:
         return path, None

tests/integration/local_toolchains/MODULE.bazel

@@ -56,7 +56,7 @@ pbs_archive(
 # installation.
 local_runtime_repo(
     name = "repo_python3",
-    interpreter_target = "@pbs_runtime//:python/bin/python3",
+    interpreter_target = "@pbs_runtime//:python/bin/python",
     on_failure = "fail",
 )