This part of the Python Guestbook code walkthrough shows how to use Jinja templates to generate dynamic web content. This page is part of a multi-page tutorial. I have run recently a benchmark of a trivial 'big table' example for various python template engines (jinja2, mako, tenjin,?tornado and wheezy.template) run on cpython2.7 and pypy1.9. Templates Being a web framework, Django needs a convenient way to generate HTML dynamically. The most common approach relies on templates. A template contains the static parts of the desired HTML output as well as some special syntax describing how dynamic content will be inserted. For a hands-on example of creating HTML pages with templates, see. A Django project can be configured with one or several template engines (or even zero if you don’t use templates). Django ships built-in backends for its own template system, creatively called the Django template language (DTL), and for the popular alternative. Backends for other template languages may be available from third-parties. Django defines a standard API for loading and rendering templates regardless of the backend. Loading consists of finding the template for a given identifier and preprocessing it, usually compiling it to an in-memory representation. Rendering means interpolating the template with context data and returning the resulting string. The is Django’s own template system. Brew install build-essential. Until Django 1.8 it was the only built-in option available. It’s a good template library even though it’s fairly opinionated and sports a few idiosyncrasies. If you don’t have a pressing reason to choose another backend, you should use the DTL, especially if you’re writing a pluggable application and you intend to distribute templates. Django’s contrib apps that include templates, like, use the DTL. For historical reasons, both the generic support for template engines and the implementation of the Django template language live in the django.template namespace. Usage The django.template.loader module defines two functions to load templates. Get_template( template_name, using=None) This function loads the template with the given name and returns a Template object. The exact type of the return value depends on the backend that loaded the template. Each backend has its own Template class. Get_template() tries each template engine in order until one succeeds. If the template cannot be found, it raises. If the template is found but contains invalid syntax, it raises. How templates are searched and loaded depends on each engine’s backend and configuration. If you want to restrict the search to a particular template engine, pass the engine’s in the using argument. Select_template( template_name_list, using=None) select_template() is just like get_template(), except it takes a list of template names. It tries each name in order and returns the first template that exists. If loading a template fails, the following two exceptions, defined in django.template, may be raised: exception TemplateDoesNotExist( msg, tried=None, backend=None, chain=None) This exception is raised when a template cannot be found. It accepts the following optional arguments for populating the on the debug page: backend The template backend instance from which the exception originated. Tried A list of sources that were tried when finding the template. ![]() This is formatted as a list of tuples containing (origin, status), where origin is an object and status is a string with the reason the template wasn’t found. Chain A list of intermediate exceptions raised when trying to load a template. This is used by functions, such as, that try to load a given template from multiple engines. Exception TemplateSyntaxError( msg) This exception is raised when a template was found but contains errors. Template objects returned by get_template() and select_template() must provide a render() method with the following signature: Template. Render( context=None, request=None) Renders this template with a given context. Simatic_s7 200_s7 300_mmc_password_unlockus-xn k`5og. If context is provided, it must be a. If it isn’t provided, the engine will render the template with an empty context. If request is provided, it must be an. Then the engine must make it, as well as the CSRF token, available in the template. How this is achieved is up to each backend. Here’s an example of the search algorithm. For this example the setting is. Tip You can use for flexible template loading.
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