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Django, mysite/ manage.py mysite/ init.py settings.py …

- - - - from django.http import HttpResponse
        def index(request):
        return HttpResponse("Hello, world. You're at the polls index.")
    - - from django.urls import path
        from . import views
        urlpatterns = [path('', views.index, name='index'),]
  - - - include()-Django chop off the path(here-polls) and send remaining path
      - python manage.py runserver
        
        http://localhost:8000/polls/
      - path()
        passed four arguments
        
        view
        
        after matching pattern, it calls the view function httpRequest
        
        kwargs
        
        passed in a dictionary to the target view
        
        route
        
        contains a URL pattern(urlpatterns)
        
        comparing the requested URL against each pattern until it finds one that matches
        
        name
        
        Naming your URL lets you refer to it unambiguously
  - - - NAME
        
        The name of your database
        
        SQLite db name-BASE_DIR / 'db.sqlite3'
        
        Other DataBase USER, PASSWORD, HOST
      - Engine
        
        django.db.backends.sqlite3
        
        django.db.backends.postgresql
        
        django.db.backends.mysql
        
        django.db.backends.oracle
        
        other backends
    - - Application make use of at least one database
        A table needs before using db
        py manage.py migrate