Values enclosed in single quotes ' or double quotes " are treated as string literals, while values without quotes are treated as template variables. This could be a problem if you want to use the value in a nested loop or an included template.
If you only want to declare the cycle but not produce the first value, you can add a silent keyword as the last keyword in the tag. For example:. When the silent keyword is used on a cycle definition, the silence automatically applies to all subsequent uses of that specific cycle tag. Outputs a whole load of debugging information, including the current context and imported modules. A string argument may also be a relative path starting with. For example, assume the following directory structure:.
In template. Filters the contents of the block through one or more filters. Multiple filters can be specified with pipes and filters can have arguments, just as in variable syntax.
Note that the block includes all the text between the filter and endfilter tags. The escape and safe filters are not acceptable arguments. Instead, use the autoescape tag to manage autoescaping for blocks of template code.
Loops over each item in an array, making the item available in a context variable. If you need to loop over a list of lists, you can unpack the values in each sublist into individual variables. For example, if your context contains a list of x,y coordinates called points , you could use the following to output the list of points:. This can also be useful if you need to access the items in a dictionary. For example, if your context contained a dictionary data , the following would display the keys and values of the dictionary:.
Keep in mind that for the dot operator, dictionary key lookup takes precedence over method lookup. Therefore if the data dictionary contains a key named 'items' , data. Avoid adding keys that are named like dictionary methods if you want to use those methods in a template items , values , keys , etc. Read more about the lookup order of the dot operator in the documentation of template variables.
These clauses are optional. Use of both and and or clauses within the same tag is allowed, with and having higher precedence than or e. Use of actual parentheses in the if tag is invalid syntax. If you need them to indicate precedence, you should use nested if tags. Contained within. This operator is supported by many Python containers to test whether the given value is in the container. The following are some examples of how x in y will be interpreted:.
Not contained within. This is the negation of the in operator. Negated object identity. Tests if two values are not the same object. This is the negation of the is operator. You can also use filters in the if expression. All of the above can be combined to form complex expressions. For such expressions, it can be important to know how the operators are grouped when the expression is evaluated - that is, the precedence rules.
The precedence of the operators, from lowest to highest, is as follows:. This follows Python exactly. So, for example, the following complex if tag:. If you need different precedence, you will need to use nested if tags. Sometimes that is better for clarity anyway, for the sake of those who do not know the precedence rules. For example, instead of using:. It has two possible uses. Checks its own rendered contents against its previous state and only displays the content if it has changed.
For example, this displays a list of days, only displaying the month if it changes:. If given one or more variables, check whether any variable has changed. For example, the following shows the date every time it changes, while showing the hour if either the hour or the date has changed:. Loads a template and renders it with the current context. The template name can either be a variable or a hard-coded quoted string, in either single or double quotes. The variable may also be any object with a render method that accepts a context.
This allows you to reference a compiled Template in your context. An included template is rendered within the context of the template that includes it. This example produces the output "Hello, John! Context: variable person is set to "John" and variable greeting is set to "Hello". If you want to render the context only with the variables provided or even no variables at all , use the only option.
No other variables are available to the included template:. This means that there is no shared state between included templates — each include is a completely independent rendering process. Blocks are evaluated before they are included. This means that a template that includes blocks from another will contain blocks that have already been evaluated and rendered - not blocks that can be overridden by, for example, an extending template.
For example, the following template would load all the tags and filters registered in somelibrary and otherlibrary located in package package :.
You can also selectively load individual filters or tags from a library, using the from argument. See Custom tag and filter libraries for more information. The arguments are:. Such string can contain format specifiers characters as described in the date filter section. The predefined formats may vary depending on the current locale and if Format localization is enabled, e.
This complex tag is best illustrated by way of an example: say that cities is a list of cities represented by dictionaries containing "name" , "population" , and "country" keys:. The following snippet of template code would accomplish this:. Improve Article. Save Article. Like Article. For more information please see:. Add a URL to urlpatterns: path '', views.
Add a URL to urlpatterns: path '', Home. Import the include function: from django. Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. AppConfig django. Python django. Project: open-synthesis Author: twschiller File: digest. You've just been added to a Mobile Survey.
Project: StormOnline Author: stormsha File: detail. Project: StormOnline Author: stormsha File: topnav. Project: django-herald Author: worthwhile File: base. DEBUG: raise return content. Project: wagtailinvoices Author: SableWalnut File: payments. Project: django-register-sample Author: naritotakizawa File: views. Response],int]: rendered html code or json Response object and http code with an error message """ if request.
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