在Python web 框架中，Django 算是比较重的一个。
不同的版本，写法还很不一样。高版本对低版本也不兼容。
2010年用django 1.3 写的一个有图片上传下载的小博客，后来运行不了了。关键是我自己还调不通了:(
后来也断断续续写过几个Django的项目。在生产环境下，对原生的django改造比较多。最近在基于Django搭一个web backend 框架。想到一步步整理一下，包括django原生的通过django-admin创建project, 创建app都整理记录一下..
下面是通过django-admin创建一个最原始的django web.
$ django-admin startproject project_001
$ cd project_001
$ python manage.py runserver
Performing system checks...
System check identified no issues (0 silenced).
You have 13 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
August 08, 2017 - 05:34:41
Django version 1.11.3, using settings 'project_001.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
按照提示，执行 migrate
$ python manage.py migrate
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying admin.0001_initial... OK
Applying admin.0002_logentry_remove_auto_add... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying auth.0007_alter_validators_add_error_messages... OK
Applying auth.0008_alter_user_username_max_length... OK
Applying sessions.0001_initial... OK
再次启动：
$ python manage.py runserver
Performing system checks...
System check identified no issues (0 silenced).
August 08, 2017 - 05:44:02
Django version 1.11.3, using settings 'project_001.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
访问页面：
可以通过浏览器，也可以通过linux 命令w3m在控制台访问
$ w3m http://127.0.0.1:8000
It worked!
Congratulations on your first Django-powered page.
Next, start your first app by running python manage.py startapp [app_label].
You're seeing this message because you have DEBUG = True in your Django settings file and you haven't configured any URLs. Get to work!
创建app
$ python manage.py startapp app_001
通过 http://ip:8000/ 在浏览器中进行访问，提示：
无法访问此网站
172.28.32.49 拒绝了我们的连接请求。
请在 Google 中搜索“172 8000”
ERR_CONNECTION_REFUSED
修改 project_001/settings.py 文件
ALLOWED_HOSTS = ['*']
#ALLOWED_HOSTS = []
再次启动 , 启动项中新增 0.0.0.0:8000
$ python manage.py runserver 0.0.0.0:8000
Performing system checks...
System check identified no issues (0 silenced).
August 08, 2017 - 05:51:40
Django version 1.11.3, using settings 'project_001.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
[08/Aug/2017 05:51:43] "GET / HTTP/1.1" 200 1716
此时，通过浏览器可以访问。默认提供 /admin url.
http://172.28.32.49:8000/admin
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创建一组账号：root/jia123456
$ python manage.py createsuperuser
Username (leave blank to use 'root'):
Email address:
Password:
Password (again):
Superuser created successfully.
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此时一个简单的django web 就算建立了。
具体地址见github, master 分支
https://github.com/jiaxiaolei/my_django_project
