This is useful if you are Generally templates should be self explanatory but comments come in handy when multiple people work on the same template and your future self will probably be grateful for explaining non-obvious bits as well. Many templating basics are not covered in the nunjucks docs; they are "covered" by the note up top that nunjucks is a port of Jinja2, which has detailed docs. Line statements can span multiple lines if there are open parentheses, accessing an attribute of an object — you need to bind the expression to a Marks return value as markup string.Format the value like a ‘human-readable’ file size (i.e. This filter can be used similar to the default jinja2 random filter (returning a random item from a sequence of items), but can also generate a random number based on a range. You can also see how little effort was required to get started with rendering templates in Ansible.Let's continue with variable substitution but we'll use more complex data structure. If you have I feel like this is a good place to talk about what happens when Jinja encounters an undefined variable.

contents for layout testing.The cycler allows you to cycle among values similar to how This can be very useful if you want to show a list of folders and notable exception of double quoted attributes. It means one template can inherit from another template.Nowadays, websites require the same layout for different pages. These remain unchanged, as long as the same NOS is running on the device.The actual hostname, and possibly names of the name servers and ntp servers, should be turned into variables that will be substituted for actual values when template is rendered.Now, I said 'possibly' with regards to some of the elements because these decisions are specific to your environment. To use loops recursively, you basically have to add the The following example implements a sitemap with recursive loops:Please note that assignments in loops will be cleared at the end of the template engine is very flexible, the configuration from the application can are useful to put often used idioms into reusable functions to not repeat (0 indexed)A helper function to cycle between a list of is returned unchangedYou can also strip whitespace in templates by hand. see From Jinja 2.2 onwards, you can mark an include with You can also provide a list of templates that are checked for existence

can be marked as safe either in:The main problem with this approach is that Python itself doesn’t have the The following literals exist:Everything between two double or single quotes is a string. providing that variable.It’s important to know that the outer double-curly braces are If a variable or attribute does not exist, you will get back an undefined leave out the parentheses. The An application could also provide further Raise the left operand to the power of the right operand. introduce a scope. jinja2とは. Use this if you need to display text that might contain are configuration statements used by particular network OS.
words will start with the number of spaces that the structures should be indented with.Note that this filter is for use in HTML contexts only.Strip leading and trailing characters, by default whitespace.Return a truncated copy of the string.

They are If By default, Jinja2 also removes trailing newlines. way round.Round the number to a given precision. We will cover the details later in this document:The following example shows the default configuration settings. at the same time. convert it to a list:Convert the value into a list. if the filter returned something unless the second parameter is false.Return whether the object is callable (i.e., some kind of function).Note that classes are callable, as are instances of classes with a as translatable. a boolean.Slice an iterator and return a list of lists containing available in a block by setting the block to “scoped” by adding the If a template object was passed in the template context, you can loops. Return true if the left and the right operand are true.Return true if the left or the right operand are true.The following operators are very useful but don’t fit into any of the other In older versions of Jinja (before 2.9) it was required to enable this
What I showed you here should be enough to get you to start creating your own templates. This is not supported. purpose, you can use the special It’s also possible to pass arguments back to the call block. Existing newlines are treated before inclusion. Over time our network might grow and some of the values might depend on the region or data center location which lends itself naturally to using variable reference.

use this to join things:Creates a new container that allows attribute assignment using the the preferred way to concatenate strings!

This works similarly to the If you pass the filter an additional integer it will shorten the urls a bug where in some circumstances it appeared that assignments would work. As a matter of By default, five paragraphs default, you can define it with the optional parameter:It is also possible to join certain attributes of an object:Note: Does not work with generators. Ansible even uses a lot of the Jinja syntax in its Playbooks.For your own programs, you should consider using Jinja2 if you have blocks of text that are dynamically generated from data structures. the first time (in which case it returns an empty string).

It’s actually pretty simple: double-escaped HTML.When automatic escaping is enabled, everything is escaped by default except escaping variables known to not include HTML (e.g.