Django (custom filters and custom labels)

• A template is a Python string that has been tagged with the Django template language. Templates can contain template tags and variables.
• A template tag is a marker that works in a template. For example, a template tag can produce the content of the control structure (if or for), get the database content, or access other template tags.
• A tag block is surrounded by {percent}
• Variable label surrounded by {{}}
• The context is a key-value pair that is passed to the template.
• Template rendering is to replace variables in the template and execute all template labels by getting values from the context.

Create a custom Label catalog

First create a templatetags directory under the app and add a few two. py files

extra_tags.py
The directory structure is as follows

Registering as an app in setting

Installed_apps = [    'Django.contrib.admin',    'Django.contrib.auth',    'Django.contrib.contenttypes',    'django.contrib.sessions',    'django.contrib.messages',    'Django.contrib.staticfiles',    'Blog',    'Mysites.templatetags', #作为app注册]

Add a custom filter in extratags.py

= template. Library () @register. Filter (Name='cut')  # namedef Mycut when used in a template (value, ARG):  # Replace the passed parameter arg with ' converted '    after conversion ')

Edit attempt function, pass value to template file

def  Index (Request):    'index.html', {'value' :'Hello Small Nine'})

Add URLs Route control

Urlpatterns = [    path ('admin/', admin.site.urls),    path ('  login/', views. Login ),    path ('index/', Views.index),]

Final start result display

Django (custom filters and custom labels)