Issue #26896: Disambiguate uses of "importer" with "finder".

Thanks to Oren Milman for the patch.
diff --git a/Lib/pkgutil.py b/Lib/pkgutil.py
index a04b7d1..15b3ae1 100644
--- a/Lib/pkgutil.py
+++ b/Lib/pkgutil.py
@@ -45,7 +45,7 @@
 
 
 def walk_packages(path=None, prefix='', onerror=None):
-    """Yields (module_loader, name, ispkg) for all modules recursively
+    """Yields (module_finder, name, ispkg) for all modules recursively
     on path, or, if path is None, all accessible modules.
 
     'path' should be either None or a list of paths to look for
@@ -102,7 +102,7 @@
 
 
 def iter_modules(path=None, prefix=''):
-    """Yields (module_loader, name, ispkg) for all submodules on path,
+    """Yields (module_finder, name, ispkg) for all submodules on path,
     or, if path is None, all top-level modules on sys.path.
 
     'path' should be either None or a list of paths to look for
@@ -184,10 +184,10 @@
         imp = importlib.import_module('imp')
 
 class ImpImporter:
-    """PEP 302 Importer that wraps Python's "classic" import algorithm
+    """PEP 302 Finder that wraps Python's "classic" import algorithm
 
-    ImpImporter(dirname) produces a PEP 302 importer that searches that
-    directory.  ImpImporter(None) produces a PEP 302 importer that searches
+    ImpImporter(dirname) produces a PEP 302 finder that searches that
+    directory.  ImpImporter(None) produces a PEP 302 finder that searches
     the current sys.path, plus any modules that are frozen or built-in.
 
     Note that ImpImporter does not currently support being used by placement
@@ -395,9 +395,9 @@
 
 
 def get_importer(path_item):
-    """Retrieve a PEP 302 importer for the given path item
+    """Retrieve a PEP 302 finder for the given path item
 
-    The returned importer is cached in sys.path_importer_cache
+    The returned finder is cached in sys.path_importer_cache
     if it was newly created by a path hook.
 
     The cache (or part of it) can be cleared manually if a
@@ -419,16 +419,16 @@
 
 
 def iter_importers(fullname=""):
-    """Yield PEP 302 importers for the given module name
+    """Yield PEP 302 finders for the given module name
 
-    If fullname contains a '.', the importers will be for the package
+    If fullname contains a '.', the finders will be for the package
     containing fullname, otherwise they will be all registered top level
-    importers (i.e. those on both sys.meta_path and sys.path_hooks).
+    finders (i.e. those on both sys.meta_path and sys.path_hooks).
 
     If the named module is in a package, that package is imported as a side
     effect of invoking this function.
 
-    If no module name is specified, all top level importers are produced.
+    If no module name is specified, all top level finders are produced.
     """
     if fullname.startswith('.'):
         msg = "Relative module name {!r} not supported".format(fullname)
diff --git a/Lib/runpy.py b/Lib/runpy.py
index af6205d..6b6fc24 100644
--- a/Lib/runpy.py
+++ b/Lib/runpy.py
@@ -98,7 +98,7 @@
     # may be cleared when the temporary module goes away
     return mod_globals.copy()
 
-# Helper to get the loader, code and filename for a module
+# Helper to get the full name, spec and code for a module
 def _get_module_details(mod_name, error=ImportError):
     if mod_name.startswith("."):
         raise error("Relative module names not supported")
@@ -253,7 +253,7 @@
         return _run_module_code(code, init_globals, run_name,
                                 pkg_name=pkg_name, script_name=fname)
     else:
-        # Importer is defined for path, so add it to
+        # Finder is defined for path, so add it to
         # the start of sys.path
         sys.path.insert(0, path_name)
         try:
diff --git a/Lib/test/test_importlib/import_/test_meta_path.py b/Lib/test/test_importlib/import_/test_meta_path.py
index c452cdd..5a41e89 100644
--- a/Lib/test/test_importlib/import_/test_meta_path.py
+++ b/Lib/test/test_importlib/import_/test_meta_path.py
@@ -76,7 +76,6 @@
                 self.__import__(mod_name)
                 assert len(log) == 1
                 args = log[0][0]
-                kwargs = log[0][1]
                 # Assuming all arguments are positional.
                 self.assertEqual(args[0], mod_name)
                 self.assertIsNone(args[1])
diff --git a/Lib/test/test_importlib/util.py b/Lib/test/test_importlib/util.py
index ce20377..f72dc45 100644
--- a/Lib/test/test_importlib/util.py
+++ b/Lib/test/test_importlib/util.py
@@ -266,7 +266,6 @@
             module = self.modules[fullname]
         except KeyError:
             return None
-        is_package = hasattr(module, '__path__')
         spec = util.spec_from_file_location(
                 fullname, module.__file__, loader=self,
                 submodule_search_locations=getattr(module, '__path__', None))
diff --git a/Lib/test/test_pkgutil.py b/Lib/test/test_pkgutil.py
index 9d20354..a820587 100644
--- a/Lib/test/test_pkgutil.py
+++ b/Lib/test/test_pkgutil.py
@@ -205,7 +205,7 @@
         del sys.meta_path[0]
 
     def test_getdata_pep302(self):
-        # Use a dummy importer/loader
+        # Use a dummy finder/loader
         self.assertEqual(pkgutil.get_data('foo', 'dummy'), "Hello, world!")
         del sys.modules['foo']