Django的URLconf中使用缺省视图参数的方法
一个方便的特性是你可以给一个视图指定默认的参数。 这样,当没有给这个参数赋值的时候将会使用默认的值。
例子:
# urls.py from django.conf.urls.defaults import * from mysite import views urlpatterns = patterns('', (r'^blog/$', views.page), (r'^blog/page(?P<num>\d+)/$', views.page), ) # views.py def page(request, num='1'): # Output the appropriate page of blog entries, according to num. # ...
在这里,两个URL表达式都指向了同一个视图 views.page ,但是第一个表达式没有传递任何参数。 如果匹配到了第一个样式, page() 函数将会对参数 num 使用默认值 "1" ,如果第二个表达式匹配成功, page() 函数将使用正则表达式传递过来的num的值。
(注:我们已经注意到设置默认参数值是字符串 `` ‘1'`` ,不是整数`` 1`` 。为了保持一致,因为捕捉给`` num`` 的值总是字符串。
就像前面解释的一样,这种技术与配置选项的联用是很普遍的。 以下这个例子比提供视图配置选项一节中的例子有些许的改进。
def my_view(request, template_name='mysite/my_view.html'): var = do_something() return render_to_response(template_name, {'var': var})

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Steps to check the Django version: 1. Open a terminal or command prompt window; 2. Make sure Django has been installed. If Django is not installed, you can use the package management tool to install it and enter the pip install django command; 3. After the installation is complete , you can use python -m django --version to check the Django version.

Django and Flask are both leaders in Python Web frameworks, and they both have their own advantages and applicable scenarios. This article will conduct a comparative analysis of these two frameworks and provide specific code examples. Development Introduction Django is a full-featured Web framework, its main purpose is to quickly develop complex Web applications. Django provides many built-in functions, such as ORM (Object Relational Mapping), forms, authentication, management backend, etc. These features allow Django to handle large

Django is a complete development framework that covers all aspects of the web development life cycle. Currently, this framework is one of the most popular web frameworks worldwide. If you plan to use Django to build your own web applications, then you need to understand the advantages and disadvantages of the Django framework. Here's everything you need to know, including specific code examples. Django advantages: 1. Rapid development-Djang can quickly develop web applications. It provides a rich library and internal

How to upgrade Django version: steps and considerations, specific code examples required Introduction: Django is a powerful Python Web framework that is continuously updated and upgraded to provide better performance and more features. However, for developers using older versions of Django, upgrading Django may face some challenges. This article will introduce the steps and precautions on how to upgrade the Django version, and provide specific code examples. 1. Back up project files before upgrading Djan

django is the backend. Details: Although Django is primarily a backend framework, it is closely related to front-end development. Through features such as Django's template engine, static file management, and RESTful API, front-end developers can collaborate with back-end developers to build powerful, scalable web applications.

The differences are: 1. Django 1.x series: This is an early version of Django, including versions 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8 and 1.9. These versions mainly provide basic web development functions; 2. Django 2.x series: This is the mid-term version of Django, including 2.0, 2.1, 2.2 and other versions; 3. Django 3.x series: This is the latest version series of Django. Including versions 3.0, 3, etc.

How to check the django version: 1. To check through the command line, enter the "python -m django --version" command in the terminal or command line window; 2. To check in the Python interactive environment, enter "import django print(django. get_version())" code; 3. Check the settings file of the Django project and find a list named INSTALLED_APPS, which contains installed application information.

Django is a web application framework written in Python that emphasizes rapid development and clean methods. Although Django is a web framework, to answer the question whether Django is a front-end or a back-end, you need to have a deep understanding of the concepts of front-end and back-end. The front end refers to the interface that users directly interact with, and the back end refers to server-side programs. They interact with data through the HTTP protocol. When the front-end and back-end are separated, the front-end and back-end programs can be developed independently to implement business logic and interactive effects respectively, and data exchange.
