Python's fifth-stage learning record---Django Foundation

Python's web framework has a variety of Django, Tornado, Flask and more, and Django has its advantages over other web frameworks: Chatty, the framework itself integrates ORM, model binding, template engine, caching, session and many more.

Basic Configuration

First, create a Django program

• Terminal command: Django-admin startproject sitename
• When the IDE creates a Django program, it is essentially automating the above command

Other common commands:

Python manage.py runserver 0.0.0.0
Python manage.py Startapp AppName
Python manage.py syncdb
Python manage.py makemigrations
Python manage.py Migrate

Python manage.py Createsuperuser

Second, the program directory

Iii. Configuration Files

1. Database

1DATABASES = {2     'default': {3     'ENGINE':'Django.db.backends.mysql',4     'NAME':'dbname',5     'USER':'Root',6     'PASSWORD':'XXX',7     'HOST':"',8     'PORT':"',9     }Ten}

# 由于Django内部连接MySQL时使用的是MySQLdb模块，而python3中还无此模块，所以需要使用pymysql来代替

# 如下设置放置的与project同名的配置的 __init__.py文件中 import pymysql pymysql.install_as_MySQLdb()　

2. Template

TEMPLATE_DIRS  = (          os.path.join(BASE_DIR, ‘templates‘ ),      )

3. static files

STATICFILES_DIRS =(

         os.path.join(BASE_DIR, ‘static‘ ),      )Routing System

1. Single Route Correspondence

URL (r'^index$', Views.index),

2. Regular-based routing

1 url (r'^index/(\d*)', Views.index),2 url (r' ^manage/(? p<name>\w*)/(? p<id>\d*)', Views.manage),

3. Add additional parameters

URL (r'^manage/(? p<name>\w*)', views.manage,{'ID': 333}),

4. Set the name for the route map

URL (r'^home', Views.home, name='H1'), url (r'  ^index/(\d*)', Views.index, name='h2'),

After you set the name, you can call it in a different place, such as:

• Template used to generate URL {% url ' h2 ' 2012}
• The function uses the Generate URL reverse (' H2 ', args= (2012,)) path: Django.urls.reverse
• Use the Get URL custom Get_absolute_url () method in model

classNewType (models. Model): Caption= Models. Charfield (max_length=16)    defGet_absolute_url (self):"""generate a URL app for each object: Generate a View-detailed URL in the object list and use this method!!! : Return:"""        #return '/%s/%s '% (self._meta.db_table, self.id)        #or         fromDjango.urlsImportReversereturnReverse'Newtype.detail', kwargs={'nid': Self.id})

View Code

Gets the URL information for the successful request match: Request.resolver_match

5, according to the app routing rules classification

url(r ‘^web/‘ ,include( ‘web.urls‘ )), 分发

6. Namespaces

A. project.urls.py

 fromDjango.conf.urlsImporturl,include urlpatterns=[url (r'^a/', Include ('App01.urls', namespace='Author-polls')), url (r'^b/', Include ('App01.urls', namespace='Publisher-polls')),]

B. app01.urls.py

 from Import URL  from Import  'app01'= [    url (r'^ (? p<pk>\d+)/$', Views.detail, name='detail')]

C. app01.views.py

def detail (Request, PK):     Print (request.resolver_match)     return HttpResponse (PK)

After you have defined the URL with the namespace, use name to generate the URL as follows:

• v = reverse (' app01:detail ', kwargs={' PK ': 11})
• {% url ' app01:detail ' pk=12 pp=99%}

The routing system in Django differs from the framework of other languages in that the URL for each request in Django has a route map so that the request can be handed to the function in the view for processing. Most other web frameworks are a route map for a class of URL requests, which makes the routing system concise.

Develop a dynamic routing system for Django through the Reflection mechanism demo: Download

Templates

The fifth stage of the Python learning record---Django basics