What basic classes does Django provide?

Django provides the following basic classes for building web applications:

• django.db.models.Model: The main class for defining data models that are mapped to database tables. All custom models inherit from it.

  # Example of a basic model definition
  from django.db import models
  
  class Article(models.Model):
      title = models.CharField(max_length=100)
      content = models.TextField()
  

• django.views.View: The base class for creating views that handle web requests and generate responses. Supports methods for various HTTP verbs (GET, POST, PUT, DELETE, etc.).

  # Example of a basic CBV definition
  from django.views import View
  from django.http import HttpResponse
  
  class MyView(View):
      def get(self, request, *args, **kwargs):
          return HttpResponse("Hello, world!")
  

• django.forms.Form: The base class for defining web forms used for collecting and validating user input. Defines form fields and validation rules.

  # Example of a basic form definition
  from django import forms
  
  class ContactForm(forms.Form):
      name = forms.CharField(max_length=100)
      email = forms.EmailField()
      message = forms.CharField(widget=forms.Textarea)
  

• django.contrib.admin.ModelAdmin: The base class for configuring the Django admin interface for a specific model. Defines how the model is displayed and edited in the admin panel.

  # Indirect inheritance, used in admin.site.register()
  # from django.contrib import admin
  # from .models import Article
  #
  # @admin.register(Article)
  # class ArticleAdmin(admin.ModelAdmin):
  #     list_display = ('title',)
  

• django.urls.URLResolver and django.urls.URLPattern: Although not directly used by developers as base classes in everyday practice, URLResolver and URLPattern are fundamental internal classes underlying the URL routing system (URLconf). URLResolver represents a nested set of URL patterns, and URLPattern matches a specific URL to a view.

  # Used for defining routes
  # from django.urls import path
  # from . import views
  #
  # urlpatterns = [
  #     path('my-view/', views.MyView.as_view()),
  # ]
  

These classes form the foundation of most components of a Django application, providing structure and functionality for data handling, request processing, form creation, and admin panel management.