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  AppConfig: Application Configuration objects store metadata for an application. Some attributes can be configured in AppConfig subclasses.  Others are set by Django and read-only. AppConfig.name:  Full Python path to the application, ex. 'django.contrib.admin'. AppConfig.name attribute defines which application the configuration applies to.  It must be set in all AppConfig subclasses. It must be unique across a Django project. AppConfig.label:  Short name for the application, ex. 'admin' This attribute allows relabeling an application when two applications have conflicting labels.  It defaults to the last component of name.  It should be a valid Python identifier. It must be unique across a Django project. AppConfig.verbose_name: Human Readable name for the Application, ex. “Administration”. This attribute defaults to label.title(). AppConfig.path: File System Path to the application directory, ex. '/usr/lib/pythonX.Y/dist-packages/django/contrib/adm...

FILTERS_DISABLE_HELP_TEXT:- Some filters provide informational help_text.  For example, csv-based filters (filters.BaseCSVFilter) inform users that “Multiple values may be    separated by commas”. You can set this to True to disable the help_text for all filters by removing the text from the rendered form’s output.

FILTERS_NULL_CHOICE_VALUE:- Set the default value for ChoiceFilter.null_value . You may want to change this value if the default 'null' string conflicts with an actual choice. Default value is 'null'

FILTERS_NULL_CHOICE_LABEL:- Set the default value for ChoiceFilter.null_label . You may enable the null choice by setting a non-None value. Default value is None.

FILTERS_EMPTY_CHOICE_LABEL:- Set the default value for ChoiceFilter.empty_label . You may disable the empty choice by setting this to None. Default value is '---------'

FILTERS_DEFAULT_LOOKUP_EXPR:- Set the default lookup expression to be generated, when none is defined. Default value is 'exact'. 

ManyToManyField is represented by django.forms.ModelMultipleChoiceField , which is a MultipleChoiceField whose choices are a model QuerySet .