Refs #23919 -- Used yield from.

django/contrib/gis/geos/mutable_list.py

@@ -312,8 +312,7 @@ class ListMixin:
         def newItems():
             for i in range(origLen + 1):
                 if i == start:
-                    for val in valueList:
-                        yield val
+                    yield from valueList
 
                 if i < origLen:
                     if i < start or i >= stop:

django/contrib/staticfiles/storage.py

@@ -402,9 +402,7 @@ class ManifestFilesMixin(HashedFilesMixin):
 
     def post_process(self, *args, **kwargs):
         self.hashed_files = OrderedDict()
-        all_post_processed = super().post_process(*args, **kwargs)
-        for post_processed in all_post_processed:
-            yield post_processed
+        yield from super().post_process(*args, **kwargs)
         self.save_manifest()
 
     def save_manifest(self):

django/contrib/staticfiles/utils.py

@@ -37,8 +37,7 @@ def get_files(storage, ignore_patterns=None, location=''):
             continue
         if location:
             dir = os.path.join(location, dir)
-        for fn in get_files(storage, ignore_patterns, dir):
-            yield fn
+        yield from get_files(storage, ignore_patterns, dir)
 
 
 def check_settings(base_url=None):

django/core/management/commands/dumpdata.py

@@ -166,8 +166,7 @@ class Command(BaseCommand):
                     if count_only:
                         yield queryset.order_by().count()
                     else:
-                        for obj in queryset.iterator():
-                            yield obj
+                        yield from queryset.iterator()
 
         try:
             self.stdout.ending = None

django/core/serializers/json.py

@@ -69,8 +69,7 @@ def Deserializer(stream_or_string, **options):
         stream_or_string = stream_or_string.decode()
     try:
         objects = json.loads(stream_or_string)
-        for obj in PythonDeserializer(objects, **options):
-            yield obj
+        yield from PythonDeserializer(objects, **options)
     except (GeneratorExit, DeserializationError):
         raise
     except Exception as exc:

django/core/serializers/pyyaml.py

@@ -70,8 +70,7 @@ def Deserializer(stream_or_string, **options):
     else:
         stream = stream_or_string
     try:
-        for obj in PythonDeserializer(yaml.load(stream, Loader=SafeLoader), **options):
-            yield obj
+        yield from PythonDeserializer(yaml.load(stream, Loader=SafeLoader), **options)
     except (GeneratorExit, DeserializationError):
         raise
     except Exception as exc:

django/db/backends/base/creation.py

@@ -113,8 +113,7 @@ class BaseDatabaseCreation:
                 if (model._meta.can_migrate(self.connection) and
                         router.allow_migrate_model(self.connection.alias, model)):
                     queryset = model._default_manager.using(self.connection.alias).order_by(model._meta.pk.name)
-                    for obj in queryset.iterator():
-                        yield obj
+                    yield from queryset.iterator()
         # Serialize to a string
         out = StringIO()
         serializers.serialize("json", get_objects(), indent=None, stream=out)

django/db/backends/utils.py

@@ -28,8 +28,7 @@ class CursorWrapper:
 
     def __iter__(self):
         with self.db.wrap_database_errors:
-            for item in self.cursor:
-                yield item
+            yield from self.cursor
 
     def __enter__(self):
         return self

django/db/models/expressions.py

@@ -337,8 +337,7 @@ class BaseExpression:
         yield self
         for expr in self.get_source_expressions():
             if expr:
-                for inner_expr in expr.flatten():
-                    yield inner_expr
+                yield from expr.flatten()
 
 
 class Expression(BaseExpression, Combinable):

django/forms/fields.py

@@ -742,8 +742,7 @@ class CallableChoiceIterator:
         self.choices_func = choices_func
 
     def __iter__(self):
-        for e in self.choices_func():
-            yield e
+        yield from self.choices_func()
 
 
 class ChoiceField(Field):

django/forms/widgets.py

@@ -539,14 +539,12 @@ class ChoiceWidget(Widget):
         options from a BoundField for choice widgets.
         """
         value = self.format_value(value)
-        for option in self.options(name, value, attrs):
-            yield option
+        yield from self.options(name, value, attrs)
 
     def options(self, name, value, attrs=None):
         """Yield a flat list of options for this widgets."""
         for group in self.optgroups(name, value, attrs):
-            for option in group[1]:
-                yield option
+            yield from group[1]
 
     def optgroups(self, name, value, attrs=None):
         """Return a list of optgroups for this widget."""

django/template/base.py

@@ -162,8 +162,7 @@ class Template:
 
     def __iter__(self):
         for node in self.nodelist:
-            for subnode in node:
-                yield subnode
+            yield from node
 
     def _render(self, context):
         return self.nodelist.render(context)

django/template/context.py

@@ -43,8 +43,7 @@ class BaseContext:
         return repr(self.dicts)
 
     def __iter__(self):
-        for d in reversed(self.dicts):
-            yield d
+        yield from reversed(self.dicts)
 
     def push(self, *args, **kwargs):
         dicts = []
@@ -192,8 +191,7 @@ class RenderContext(BaseContext):
     template = None
 
     def __iter__(self):
-        for d in self.dicts[-1]:
-            yield d
+        yield from self.dicts[-1]
 
     def __contains__(self, key):
         return key in self.dicts[-1]

django/template/defaulttags.py

@@ -148,10 +148,8 @@ class ForNode(Node):
              reversed_text)
 
     def __iter__(self):
-        for node in self.nodelist_loop:
-            yield node
-        for node in self.nodelist_empty:
-            yield node
+        yield from self.nodelist_loop
+        yield from self.nodelist_empty
 
     def render(self, context):
         if 'forloop' in context:
@@ -297,8 +295,7 @@ class IfNode(Node):
 
     def __iter__(self):
         for _, nodelist in self.conditions_nodelists:
-            for node in nodelist:
-                yield node
+            yield from nodelist
 
     @property
     def nodelist(self):

django/template/loaders/cached.py

@@ -63,8 +63,7 @@ class Loader(BaseLoader):
 
     def get_template_sources(self, template_name):
         for loader in self.loaders:
-            for origin in loader.get_template_sources(template_name):
-                yield origin
+            yield from loader.get_template_sources(template_name)
 
     def cache_key(self, template_name, skip=None):
         """

django/test/client.py

@@ -83,8 +83,7 @@ class FakePayload:
 
 def closing_iterator_wrapper(iterable, close):
     try:
-        for item in iterable:
-            yield item
+        yield from iterable
     finally:
         request_finished.disconnect(close_old_connections)
         close()                                 # will fire request_finished

tests/model_forms/models.py

@@ -348,8 +348,7 @@ class Colour(models.Model):
     name = models.CharField(max_length=50)
 
     def __iter__(self):
-        for number in range(5):
-            yield number
+        yield from range(5)
 
     def __str__(self):
         return self.name

tests/queries/tests.py

@@ -787,8 +787,7 @@ class Queries1Tests(TestCase):
         n_obj = Note.objects.all()[0]
 
         def g():
-            for i in [n_obj.pk]:
-                yield i
+            yield n_obj.pk
         self.assertQuerysetEqual(Note.objects.filter(pk__in=f()), [])
         self.assertEqual(list(Note.objects.filter(pk__in=g())), [n_obj])
 

tests/template_tests/filter_tests/test_unordered_list.py

@@ -103,9 +103,7 @@ class FunctionTests(SimpleTestCase):
         )
 
         def item_generator():
-            yield a
-            yield b
-            yield c
+            yield from (a, b, c)
 
         self.assertEqual(
             unordered_list(item_generator()),
@@ -129,9 +127,7 @@ class FunctionTests(SimpleTestCase):
         )
 
         def item_generator():
-            yield a
-            yield b
-            yield c
+            yield from (a, b, c)
 
         self.assertEqual(
             unordered_list(item_generator(), autoescape=False),