Close #15519: Properly expose WindowsRegistryFinder in importlib and bring the name into line with normal import terminology. Original patch by Eric Snow

Doc/library/importlib.rst

@@ -603,6 +603,17 @@ find and load modules.
     instantiation.
 
 
+.. class:: WindowsRegistryFinder
+
+   :term:`Finder` for modules declared in the Windows registry.  This class
+   implements the :class:`importlib.abc.MetaPathFinder` ABC.
+
+   Only class methods are defined by this class to alleviate the need for
+   instantiation.
+
+   .. versionadded:: 3.3
+
+
 .. class:: PathFinder
 
     :term:`Finder` for :data:`sys.path`. This class implements the

Lib/importlib/_bootstrap.py

@@ -720,9 +720,9 @@ class FrozenImporter:
         return _imp.is_frozen_package(fullname)
 
 
-class WindowsRegistryImporter:
+class WindowsRegistryFinder:
 
-    """Meta path import for modules declared in the Windows registry.
+    """Meta path finder for modules declared in the Windows registry.
     """
 
     REGISTRY_KEY = (
@@ -1683,7 +1683,7 @@ def _setup(sys_module, _imp_module):
     if builtin_os == 'nt':
         SOURCE_SUFFIXES.append('.pyw')
         if '_d.pyd' in _imp.extension_suffixes():
-            WindowsRegistryImporter.DEBUG_BUILD = True
+            WindowsRegistryFinder.DEBUG_BUILD = True
 
 
 def _install(sys_module, _imp_module):
@@ -1694,5 +1694,5 @@ def _install(sys_module, _imp_module):
     sys.meta_path.append(BuiltinImporter)
     sys.meta_path.append(FrozenImporter)
     if _os.__name__ == 'nt':
-        sys.meta_path.append(WindowsRegistryImporter)
+        sys.meta_path.append(WindowsRegistryFinder)
     sys.meta_path.append(PathFinder)

Lib/importlib/abc.py

@@ -59,7 +59,7 @@ class MetaPathFinder(Finder):
         raise NotImplementedError
 
 _register(MetaPathFinder, machinery.BuiltinImporter, machinery.FrozenImporter,
-          machinery.PathFinder)
+          machinery.PathFinder, machinery.WindowsRegistryFinder)
 
 
 class PathEntryFinder(Finder):

Lib/importlib/machinery.py

@@ -6,6 +6,7 @@ from ._bootstrap import (SOURCE_SUFFIXES, DEBUG_BYTECODE_SUFFIXES,
                          OPTIMIZED_BYTECODE_SUFFIXES, BYTECODE_SUFFIXES)
 from ._bootstrap import BuiltinImporter
 from ._bootstrap import FrozenImporter
+from ._bootstrap import WindowsRegistryFinder
 from ._bootstrap import PathFinder
 from ._bootstrap import FileFinder
 from ._bootstrap import SourceFileLoader

Lib/test/test_importlib/test_abc.py

@@ -34,7 +34,7 @@ class MetaPathFinder(InheritanceTests, unittest.TestCase):
 
     superclasses = [abc.Finder]
     subclasses = [machinery.BuiltinImporter, machinery.FrozenImporter,
-                    machinery.PathFinder]
+                    machinery.PathFinder, machinery.WindowsRegistryFinder]
 
 class PathEntryFinder(InheritanceTests, unittest.TestCase):
 

Misc/NEWS

@@ -72,6 +72,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #15519: Properly expose WindowsRegistryFinder in importlib (and use
+  the correct term for it). Original patch by Eric Snow.
+
 - Issue #15502: Bring the importlib ABCs into line with the current state
   of the import protocols given PEP 420. Original patch by Eric Snow.