Reorder imports in importlib.abc for clarity and consistency

Author: brettcannon

Lib/importlib/abc.py

@@ -1,6 +1,7 @@
 """Abstract base classes related to import."""
 from . import _bootstrap_external
 from . import machinery
+
 try:
     import _frozen_importlib
 except ImportError as exc:
@@ -11,10 +12,12 @@
     import _frozen_importlib_external
 except ImportError:
     _frozen_importlib_external = _bootstrap_external
-from ._abc import Loader
 import abc
 
 
+# Public API
+from ._abc import Loader
+
 __all__ = [
     'Loader', 'MetaPathFinder', 'PathEntryFinder',
     'ResourceLoader', 'InspectLoader', 'ExecutionLoader',