id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 35046 BlankChoiceIterator causes AttributeError for some existing packages and projects Hazho Human nobody "The iterators should have method __len__ ...! while this is not the case for (BlankChoiceIterator) in the current version of Django (5.0), this is why the following error raised: AttributeError: 'BlankChoiceIterator' object has no attribute '__len__'. Did you mean: '__le__'? to solve this, simply the BlankChoiceIterator class should have the method __len__ returning 0 as indication for emptiness. this is important because the package maintainer or project author may not find the way to update their code accordingly, for example the projects depend on django-countries would have the following trace raised (note there is no obvious indication where in the project code is the main causer that calls __len__ of BlankChoiceIterator objects: {{{ Traceback (most recent call last): File ""C:\env_django_simple_payment_system\Lib\site-packages\django\core\handlers\exception.py"", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\core\handlers\base.py"", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\django_simple_payment_system\wallets\views.py"", line 38, in index return render(request, template_path, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\shortcuts.py"", line 24, in render content = loader.render_to_string(template_name, context, request, using=using) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\loader.py"", line 62, in render_to_string return template.render(context, request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\backends\django.py"", line 61, in render return self.template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 171, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 163, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 1000, in render return SafeString("""".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 961, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\loader_tags.py"", line 210, in render return template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 173, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 163, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 1000, in render return SafeString("""".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 961, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\defaulttags.py"", line 241, in render nodelist.append(node.render_annotated(context)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 961, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 1065, in render return render_value_in_context(output, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\template\base.py"", line 1042, in render_value_in_context value = str(value) ^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\forms\utils.py"", line 79, in __str__ return self.as_widget() ^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\forms\boundfield.py"", line 95, in as_widget attrs = self.build_widget_attrs(attrs, widget) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\forms\boundfield.py"", line 270, in build_widget_attrs widget.use_required_attribute(self.initial) File ""C:\env_django_simple_payment_system\Lib\site-packages\django\forms\widgets.py"", line 781, in use_required_attribute first_choice = next(iter(self.choices), None) ^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django_countries\widgets.py"", line 29, in get_choices self._choices: ChoiceList = list(self._choices) ^^^^^^^^^^^^^^^^^^^ File ""C:\env_django_simple_payment_system\Lib\site-packages\django\utils\functional.py"", line 188, in __wrapper__ return getattr(result, __method_name)(*args, **kw) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'BlankChoiceIterator' object has no attribute '__len__'. Did you mean: '__le__'? }}} the solution can be as the following: {{{ # django/utils/choices.py class BlankChoiceIterator(BaseChoiceIterator): """"""Iterator to lazily inject a blank choice."""""" # existing code def __len__(self): return 0 }}} " Bug closed Utilities 5.0 Normal invalid Hazho Human Nick Pope Dmytro Litvinov Unreviewed 0 0 0 0 0 0