Django学习笔记 Django的工程目录

mysite
├── manage.py 管理项目：包括数据库建立、服务器运行、测试……
└── mysite
    ├── __init__.py
    ├── settings.py 配置文件：应用、中间件、数据库、静态目录各种配置……
    ├── urls.py URL映射配置文件L决定一个url访问被哪个程序（函数）响应
    └── wsgi.py Python应用程序或框架和Web服务器之间接口
运行python manage.py可以看到其后可以跟的一些命令：

[auth]
    changepassword 更改超级用户的密码
    createsuperuser 创建一个超级用户（用于管理django后台）

[django]
    check
    compilemessages
    createcachetable
    dbshell
    diffsettings
    dumpdata
    flush
    inspectdb
    loaddata
    makemessages
    makemigrations
    migrate 用于创建数据库的
    sendtestemail
    shell 给我们提供一个用于调试的shell
    showmigrations
    sqlflush
    sqlmigrate
    sqlsequencereset
    squashmigrations
    startapp
    startproject
    test
    testserver

[sessions]
    clearsessions

[staticfiles]
    collectstatic
    findstatic
    runserver

python manage.py后面带的参数

通过命令：python manage.py runserver 启动一个开发服务器。
通过命令：python manage.py runserver 0.0.0.0:8080 更改服务器启动的host和端口（变为http://0.0.0.0:8080）。
通过命令：python manage.py shell 可以进入django提供给我们的一个交互式命令行。在该交互式命令行中可以进行很多操作，如直接访问数据库。

 """
 Django settings for mysite project.

 Generated by 'django-admin startproject' using Django 1.9.5.

 For more information on this file, see
 https://docs.djangoproject.com/en/1.9/topics/settings/

 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/1.9/ref/settings/
 """

 import os

 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/1.9/howto/deployment/checklist/

 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = 'uva%@my)iwu(qhj98()oki*xe@k+s-difty&248rym9*b^f20-'

 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True

 ALLOWED_HOSTS = []

 # Application definition

 INSTALLED_APPS = [
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
 ]

 MIDDLEWARE_CLASSES = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
 ]

 ROOT_URLCONF = 'mysite.urls'

 TEMPLATES = [
     {
         'BACKEND': 'django.template.backends.django.DjangoTemplates',
         'DIRS': [],
         'APP_DIRS': True,
         'OPTIONS': {
             'context_processors': [
                 'django.template.context_processors.debug',
                 'django.template.context_processors.request',
                 'django.contrib.auth.context_processors.auth',
                 'django.contrib.messages.context_processors.messages',
             ],
         },
     },
 ]

 WSGI_APPLICATION = 'mysite.wsgi.application'

 # Database
 # https://docs.djangoproject.com/en/1.9/ref/settings/#databases

 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',
         'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
     }
 }

 # Password validation
 # https://docs.djangoproject.com/en/1.9/ref/settings/#auth-password-validators

 AUTH_PASSWORD_VALIDATORS = [
     {
         'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
     },
     {
         'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
     },
     {
         'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
     },
     {
         'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
     },
 ]

 # Internationalization
 # https://docs.djangoproject.com/en/1.9/topics/i18n/

 LANGUAGE_CODE = 'en-us'

 TIME_ZONE = 'UTC'

 USE_I18N = True

 USE_L10N = True

 USE_TZ = True

 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/1.9/howto/static-files/

 STATIC_URL = '/static/'

settings.py

整个网站的所有配置相关信息都在setting.py中。
ALLOWED_HOST : 允许访问的IP域
INSTALLED_APPS : 已经安装的引用
MIDDLEWARE_CLASSES : 已经安装的中间件
ROOT_URLCONF = 'mysite.urls' URL的根目录
TEMPLATES ： 模板引擎
DATABASES : 数据库引擎
LANGUAGE_CODE : 网站的语言
TIME_ZONE : 时区

 """mysite URL Configuration

 The `urlpatterns` list routes URLs to views. For more information please see:
     https://docs.djangoproject.com/en/1.9/topics/http/urls/
 Examples:
 Function views
     1. Add an import:  from my_app import views
     2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
 Class-based views
     1. Add an import:  from other_app.views import Home
     2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
 Including another URLconf
     1. Import the include() function: from django.conf.urls import url, include
     2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
 """
 from django.conf.urls import url
 from django.contrib import admin

 urlpatterns = [
     url(r'^admin/', admin.site.urls),
 ]

urls.py

urlpatterns表中有关于映射的所有信息。

 """
 WSGI config for mysite project.

 It exposes the WSGI callable as a module-level variable named ``application``.

 For more information on this file, see
 https://docs.djangoproject.com/en/1.9/howto/deployment/wsgi/
 """

 import os

 from django.core.wsgi import get_wsgi_application

 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")

 application = get_wsgi_application()

wsgi.py

django起的是一个轻量级的调试服务器，真正做到产品的时候是用的大型的服务器。
django和大型服务器之间的接口是通过wsgi来配置的。