pep 484: explicit reexport as intended (#4586)

See discussion on typing-sig.
This doesn't take care of some third_party libraries, will follow up on
those.

Co-authored-by: hauntsaninja <>

stdlib/3/os/__init__.pyi

@@ -8,7 +8,7 @@ from _typeshed import (
     OpenBinaryModeWriting,
     OpenTextMode,
 )
-from builtins import OSError as error
+from builtins import OSError
 from io import BufferedRandom, BufferedReader, BufferedWriter, FileIO, TextIOWrapper as _TextIOWrapper
 from posix import listdir as listdir, times_result
 from typing import (
@@ -46,6 +46,8 @@ _T = TypeVar("_T")
 
 # ----- os variables -----
 
+error = OSError
+
 supports_bytes_environ: bool
 
 supports_dir_fd: Set[Callable[..., Any]]
@@ -268,7 +270,9 @@ class stat_result:
     st_type: int
 
 if sys.version_info >= (3, 6):
-    from builtins import _PathLike as PathLike  # See comment in builtins
+    from builtins import _PathLike
+
+    PathLike = _PathLike  # See comment in builtins
 
 _FdOrAnyPath = Union[int, AnyPath]