Processing large, potentially malformed HTML strings can be resource-intensive and impact service performance. truncatewords_html limits input to the first five million characters.

The {% if %} tag evaluates a variable, and if that variable is “true” (i.e. exists, is not empty, and is not a false boolean value) the contents of the block are output:

Passing None as the value removes the parameter from the query string. For example, if the current query string is ?color=green&size=M, the output will be ?size=M.

By default, when you use the as keyword with the cycle tag, the usage of {% cycle %} that initiates the cycle will itself produce the first value in the cycle. 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:

'a.m.' or 'p.m.' (Note that this is slightly different than PHP’s output, because this includes periods to match Associated Press style.)

Any valid template lookup is a legal grouping attribute for the regroup tag, including methods, attributes, dictionary keys and list items. For example, if the “country” field is a foreign key to a class with an attribute “description,” you could use:

You couldn’t use the safe filter directly in this case, as it would first convert the variable into a string, rather than working with the individual elements of the sequence.

Adds or modifies parameters in the query string. Each keyword argument will be added to the query string, replacing any existing value for that key. For instance, if the current query string is ?color=green, the output will be ?color=red&size=S.

Replaces line breaks in plain text with appropriate HTML; a single newline becomes an HTML line break (
) and a new line followed by a blank line becomes a paragraph break (

).

the output will be the string "01:23" (The "TIME_FORMAT" format specifier for the de locale as shipped with Django is "H:i").

Applies HTML escaping to a string (see the escape filter for details). This filter is applied immediately and returns a new, escaped string. This is useful in the rare cases where you need multiple escaping or want to apply other filters to the escaped results. Normally, you want to use the escape filter.

The urlize filter also takes an optional parameter autoescape. If autoescape is True, the link text and URLs will be escaped using Django’s built-in escape filter. The default value for autoescape is True.

The format passed can also be one of the predefined ones DATE_FORMAT, DATETIME_FORMAT, SHORT_DATE_FORMAT or SHORT_DATETIME_FORMAT. The predefined formats may vary depending on the current locale and if Format localization is enabled, e.g.:

ISO-8601 week-numbering year, corresponding to the ISO-8601 week number (W) which uses leap weeks. See Y for the more common year format.

Takes an optional argument that is a variable containing the date to use as the comparison point (without the argument, the comparison point is now). For example, if blog_date is a date instance representing midnight on 1 June 2006, and comment_date is a date instance for 08:00 on 1 June 2006, then the following would return “8 hours”:

This {% url ... as var %} syntax will not cause an error if the view is missing. In practice you’ll use this to link to views that are optional:

Django comes with a couple of other template-tag libraries that you have to enable explicitly in your INSTALLED_APPS setting and enable in your template with the {% load %} tag.

The first iteration produces HTML that refers to class row1, the second to row2, the third to row1 again, and so on for each iteration of the loop.

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If value is "Check out www.djangoproject.com", the output would be 'Check out www.djangoproj…'.

Marks a string as not requiring further HTML escaping prior to output. When autoescaping is off, this filter has no effect.

Loops over each item in an array, making the item available in a context variable. For example, to display a list of athletes provided in athlete_list:

Note that if the URL you’re reversing doesn’t exist, you’ll get an NoReverseMatch exception raised, which will cause your site to display an error page.

In the above, if athlete_list is not empty, the number of athletes will be displayed by the {{ athlete_list|length }} variable.

Converts an IRI (Internationalized Resource Identifier) to a string that is suitable for including in a URL. This is necessary if you’re trying to use strings containing non-ASCII characters in a URL.

outputs 9 de Enero de 2008 (the DATE_FORMAT format specifier for the es locale is r'j \d\e F \d\e Y'). Both “d” and “e” are backslash-escaped, because otherwise each is a format string that displays the day and the timezone name, respectively.

If the argument passed to floatformat has the g suffix, it will force grouping by the THOUSAND_SEPARATOR for the active locale. For example, when the active locale is en (English):

The above code will output the joined elements of my_list unescaped. This is because the filter chaining sequence executes first join on my_list (without applying escaping to each item since autoescape is off), marking the result as safe. Subsequently, this safe result will be fed to escape filter, which does not apply a second round of escaping.

Do not mix both positional and keyword syntax in a single call. All arguments required by the URLconf should be present.

Argument: Number of characters that link text should be truncated to, including the ellipsis that’s added if truncation is necessary.

An included template is rendered within the context of the template that includes it. This example produces the output "Hello, John!":

Time, in 12-hour hours, minutes and ‘a.m.’/’p.m.’, with minutes left off if they’re zero and the special-case strings ‘midnight’ and ‘noon’ if appropriate. Proprietary extension.

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If the argument passed to floatformat is negative, it will round a number to that many decimal places – but only if there’s a decimal part to be displayed. For example:

Applies the safe filter to each element of a sequence. Useful in conjunction with other filters that operate on sequences, such as join. For example:

By storing the value in a data attribute, we ensure it’s escaped appropriately if we want to use it in a JavaScript context.

In some cases you might want to refer to the current value of a cycle without advancing to the next value. To do this, give the {% cycle %} tag a name, using “as”, like this:

To use request.GET as the default QueryDict instance, the django.template.context_processors.request context processor should be enabled. If it’s not enabled, you must either explicitly pass the request object into the template context, or provide a QueryDict instance to this tag.

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.

{% extends "base.html" %} (with quotes) uses the literal value "base.html" as the name of the parent template to extend.

Returns the value turned into a list. For a string, it’s a list of characters. For an integer, the argument is cast to a string before creating a list.

If value is "Check out www.djangoproject.com", the output will be "Check out www.djangoproject.com".

The list is assumed to be in the proper format. For example, if var contains ['States', ['Kansas', ['Lawrence', 'Topeka'], 'Illinois']], then {{ var|unordered_list }} would return:

Outputs the first argument variable that is not “false” (i.e. exists, is not empty, is not a false boolean value, and is not a zero numeric value). Outputs nothing if all the passed variables are “false”.

Converts URLs and email addresses into clickable links just like urlize, but truncates URLs longer than the given character limit.

Time zone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.

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:

From then on, you can insert the current value of the cycle wherever you’d like in your template by referencing the cycle name as a context variable. If you want to move the cycle to the next value independently of the original cycle tag, you can use another cycle tag and specify the name of the variable. So, the following template:

Given format can be the predefined one TIME_FORMAT, or a custom format, same as the date filter. Note that the predefined format is locale-dependent.

{% extends variable %} uses the value of variable. If the variable evaluates to a string, Django will use that string as the name of the parent template. If the variable evaluates to a Template object, Django will use that object as the parent template.

The template system has no concept of “escaping” individual characters. However, you can use the {% templatetag %} tag to display one of the template tag character combinations.

Ignores everything between {% comment %} and {% endcomment %}. An optional note may be inserted in the first tag. For example, this is useful when commenting out code for documenting why the code was disabled.

Controls the current auto-escaping behavior. This tag takes either on or off as an argument and that determines whether auto-escaping is in effect inside the block. The block is closed with an endautoescape ending tag.

The first argument is a URL pattern name. It can be a quoted literal or any other context variable. Additional arguments are optional and should be space-separated values that will be used as arguments in the URL. The example above shows passing positional arguments. Alternatively you may use keyword syntax:

Strictly speaking, filesizeformat does not conform to the International System of Units which recommends using KiB, MiB, GiB, etc. when byte sizes are calculated in powers of 1024 (which is the case here). Instead, Django uses traditional unit names (KB, MB, GB, etc.) corresponding to names that are more commonly used.

In this example, we have both the alternating odd/even rows and a “major” row every fifth row. Only the five-row cycle is reset when a category changes.

the output would be the string "09/01/2008" (the "SHORT_DATE_FORMAT" format specifier for the es locale as shipped with Django is "d/m/Y").

It is also able to consume standard context variables, e.g. assuming a user_stylesheet variable is passed to the template:

Similar to truncatechars, except that it is aware of HTML tags. Any tags that are opened in the string and not closed before the truncation point are closed immediately after the truncation.

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:

You can also use the syntax {% now "Y" as current_year %} to store the output (as a string) inside a variable. This is useful if you want to use {% now %} inside a template tag like blocktranslate for example:

Displays the current date and/or time, using a format according to the given string. Such string can contain format specifiers characters as described in the date filter section.

In some cases you might want to capture the result of widthratio in a variable. It can be useful, for instance, in a blocktranslate like this:

This library provides control over time zone conversions in templates. Like l10n, you only need to load the library using {% load tz %}, but you’ll usually also set USE_TZ to True so that conversion to local time happens by default.

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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 this_value is 175, max_value is 200, and max_width is 100, the image in the above example will be 88 pixels wide (because 175/200 = .875; .875 * 100 = 87.5 which is rounded up to 88).

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Note that you can backslash-escape a format string if you want to use the “raw” value. In this example, both “o” and “f” are backslash-escaped, because otherwise each is a format string that displays the year and the time, respectively:

There is one exception the above rule: When passed a datetime value with attached timezone information (a time-zone-aware datetime instance) the time filter will accept the timezone-related format specifiers 'e', 'O' , 'T' and 'Z'.

XSS attacks are mitigated by escaping the characters “<”, “>” and “&”. For example if value is {'hello': 'world&'}, the output is:

Escapes characters for use as a whole JavaScript string literal, within single or double quotes, as below. This filter does not make the string safe for use in “JavaScript template literals” (the JavaScript backtick syntax). Any other uses not listed above are not supported. It is generally recommended that data should be passed using HTML data- attributes, or the json_script filter, rather than in embedded JavaScript.

If value is the string "Joel", the output would be the list ['J', 'o', 'e', 'l']. If value is 123, the output will be the list ['1', '2', '3'].

This library allows specifying translatable text in templates. To enable it, set USE_I18N to True, then load it with {% load i18n %}.

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Note that if an empty string is given, the default value will not be used. Use the default filter if you want to fallback for empty strings.

If the QueryDict is empty and no additional parameters are provided, an empty string is returned. A non-empty result includes a leading "?".

If not provided, the ‘/’ character is assumed safe. An empty string can be provided when all characters should be escaped. For example:

Only space between tags is removed – not space between tags and text. In this example, the space around Hello won’t be stripped:

You can provide a custom QueryDict to be used instead of request.GET. So if my_query_dict is , this outputs ?color=blue.

When auto-escaping is in effect, all content derived from variables has HTML escaping applied before placing the result into the output (but after any filters are applied). This is equivalent to manually applying the escape filter to each variable.

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.

Let’s walk through this example. {% regroup %} takes three arguments: the list you want to regroup, the attribute to group by, and the name of the resulting list. Here, we’re regrouping the cities list by the country attribute and calling the result country_list.

Normally the template name is relative to the template loader’s root directory. A string argument may also be a relative path starting with ./ or ../. For example, assume the following directory structure:

When the silent keyword is used on a cycle definition, the silence automatically applies to all subsequent uses of that specific cycle tag. The following template would output nothing, even though the second call to {% cycle %} doesn’t specify silent:

Note that striptags doesn’t give any guarantee about its output being HTML safe, particularly with non valid HTML input. So NEVER apply the safe filter to a striptags output. If you are looking for something more robust, consider using a third-party HTML sanitizing tool.

As you can see, the if tag may take one or several {% elif %} clauses, as well as an {% else %} clause that will be displayed if all previous conditions fail. These clauses are optional.

Note that {% regroup %} does not order its input! Our example relies on the fact that the cities list was ordered by country in the first place. If the cities list did not order its members by country, the regrouping would naively display more than one group for a single country. For example, say the cities list was set to this (note that the countries are not grouped together):

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The escape and safe filters are not acceptable arguments. Instead, use the autoescape tag to manage autoescaping for blocks of template code.

This filter will first try to coerce both values to integers. If this fails, it’ll attempt to add the values together anyway. This will work on some data types (strings, list, etc.) and fail on others. If it fails, the result will be an empty string.

You can use variables, too. For example, if you have two template variables, rowvalue1 and rowvalue2, you can alternate between their values like this:

Normally the template name is relative to the template loader’s root directory. A string argument may also be a relative path starting with ./ or ../ as described in the extends tag.

It also supports domain-only links ending in one of the original top level domains (.com, .edu, .gov, .int, .mil, .net, and .org). For example, djangoproject.com gets converted.

For creating bar charts and such, this tag calculates the ratio of a given value to a maximum value, and then applies that ratio to a constant.

Similar to timesince, except that it measures the time from now until the given date or datetime. For example, if today is 1 June 2006 and conference_date is a date instance holding 29 June 2006, then {{ conference_date|timeuntil }} will return “4 weeks”.

In addition to web links, urlize also converts email addresses into mailto: links. If value is "Send questions to foo@example.com", the output will be "Send questions to foo@example.com".

Takes an optional argument that is a variable containing the date to use as the comparison point (instead of now). If from_date contains 22 June 2006, then the following will return “1 week”:

Minutes is the smallest unit used, and “0 minutes” will be returned for any date that is in the past relative to the comparison point.

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If value is a datetime object (e.g., the result of datetime.datetime.now()), the output will be the string 'Wed 09 Jan 2008'.

To link to static files that are saved in STATIC_ROOT Django ships with a static template tag. If the django.contrib.staticfiles app is installed, the tag will serve files using url() method of the storage specified by staticfiles in STORAGES. For example:

This will output a list of elements with class alternating between row1 and row2. The subtemplate will have access to rowcolors in its context and the value will match the class of the that encloses it. If the silent keyword were to be omitted, row1 and row2 would be emitted as normal text, outside the element.

Converts to ASCII. Converts spaces to hyphens. Removes characters that aren’t alphanumerics, underscores, or hyphens. Converts to lowercase. Also strips leading and trailing whitespace.

{% regroup %} produces a list (in this case, country_list) of group objects. Group objects are instances of namedtuple() with two fields:

For example, the following template would load all the tags and filters registered in somelibrary and otherlibrary located in package package:

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:

Note that you can backslash-escape a format string if you want to use the “raw” value. In this example, both “h” and “m” are backslash-escaped, because otherwise each is a format string that displays the hour and the month, respectively:

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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.

© 2005-2024 Django Software Foundation and individual contributors. Django is a registered trademark of the Django Software Foundation.

Use of actual parentheses in the if tag is invalid syntax. If you need them to indicate precedence, you should use nested if tags.

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Caches a complex variable under a simpler name. This is useful when accessing an “expensive” method (e.g., one that hits the database) multiple times.

The for tag can take an optional {% empty %} clause whose text is displayed if the given array is empty or could not be found:

Returns an absolute path reference (a URL without the domain name) matching a given view and optional parameters. Any special characters in the resulting path will be encoded using iri_to_uri().

The format passed can be one of the predefined ones DATE_FORMAT, DATETIME_FORMAT, SHORT_DATE_FORMAT or SHORT_DATETIME_FORMAT, or a custom format that uses the format specifiers shown in the table above. Note that predefined formats may vary depending on the current locale.

Within the scope of disabled auto-escaping, chaining filters, including escape, may cause unexpected (but documented) results such as the following:

Another solution is to sort the data in the template using the dictsort filter, if your data is in a list of dictionaries:

Minutes is the smallest unit used, and “0 minutes” will be returned for any date that is in the future relative to the comparison point.

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If urlize is applied to text that already contains HTML markup, or to email addresses that contain single quotes ('), things won’t work as expected. Apply this filter only to plain text.

Formats the variable according to the argument, a string formatting specifier. This specifier uses the printf-style String Formatting syntax, with the exception that the leading “%” is dropped.

Takes a list of dictionaries and returns that list sorted in reverse order by the key given in the argument. This works exactly the same as the above filter, but the returned value will be in reverse order.

If num_messages is 1, the output will be You have 1 message. If num_messages is 2 the output will be You have 2 messages.

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:

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:

This is especially important when using filters that operate on sequences, for example join. If you need to escape each element in a sequence, use the dedicated escapeseq filter.

The include tag should be considered as an implementation of “render this subtemplate and include the HTML”, not as “parse this subtemplate and include its contents as if it were part of the parent”. 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.

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Produces one of its arguments each time this tag is encountered. The first argument is produced on the first encounter, the second argument on the second encounter, and so forth. Once all arguments are exhausted, the tag cycles to the first argument and produces it again.

As mentioned in the autoescape section, when filters including escape are chained together, it can result in unexpected outcomes if preceding filters mark a potentially unsafe string as safe due to the lack of escaping caused by autoescape being off.

You can also selectively load individual filters or tags from a library, using the from argument. In this example, the template tags/filters named foo and bar will be loaded from somelibrary:

dictsort can also order a list of lists (or any other object implementing __getitem__()) by elements at specified index. For example:

Using urlize or urlizetrunc can incur a performance penalty, which can become severe when applied to user controlled values such as content stored in a TextField. You can use truncatechars to add a limit to such inputs:

You can use the {% regroup %} tag to group the list of cities by country. The following snippet of template code would accomplish this:

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When used without an argument, rounds a floating-point number to one decimal place – but only if there’s a decimal part to be displayed. For example:

This will follow the normal namespaced URL resolution strategy, including using any hints provided by the context as to the current application.

For words that don’t pluralize by simple suffix, you can specify both a singular and plural suffix, separated by a comma.

Processing large, potentially malformed HTML strings can be resource-intensive and impact service performance. truncatechars_html limits input to the first five million characters.

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Output is always localized (independently of the {% localize off %} tag) unless the argument passed to floatformat has the u suffix, which will force disabling localization. For example, when the active locale is pl (Polish):

This is compatible with a strict Content Security Policy that prohibits in-page script execution. It also maintains a clean separation between passive data and executable code.

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This document describes Django’s built-in template tags and filters. It is recommended that you use the automatic documentation, if available, as this will also include documentation for any custom tags or filters installed.

Truncates a string if it is longer than the specified number of characters. Truncated strings will end with a translatable ellipsis character (”…”).

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:

This library provides control over the localization of values in templates. You only need to load the library using {% load l10n %}.

When used without a format string, the DATE_FORMAT format specifier is used. Assuming the same settings as the previous example:

You can also designate a specific closing tag, allowing the use of {% endverbatim %} as part of the unrendered contents:

Outputs the current query string with the addition of the size parameter. Following the previous example, the output would be ?color=green&size=M.

You can use any number of values in a cycle tag, separated by spaces. Values enclosed in single quotes (') or double quotes (") are treated as string literals, while values without quotes are treated as template variables.

A common example of using this tag is to preserve the current query string when displaying a page of results, while adding a link to the next and previous pages of results. For example, if the paginator is currently on page 3, and the current query string is ?color=blue&size=M&page=3, the following code would output ?color=blue&size=M&page=4:

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These format characters are not used in Django outside of templates. They were designed to be compatible with PHP to ease transitioning for designers.

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The easiest solution to this gotcha is to make sure in your view code that the data is ordered according to how you want to display it.

Applies the escape filter to each element of a sequence. Useful in conjunction with other filters that operate on sequences, such as join. For example:

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Converts a string into titlecase by making words start with an uppercase character and the remaining characters lowercase. This tag makes no effort to keep “trivial words” in lowercase.

Or, if country is a field with choices, it will have a get_FOO_display() method available as an attribute, allowing you to group on the display string rather than the choices key:

Maps values for True, False, and (optionally) None, to the strings “yes”, “no”, “maybe”, or a custom mapping passed as a comma-separated list, and returns one of those strings according to the value:

This template tag works on links prefixed with http://, https://, or www.. For example, https://djangocon.eu will get converted but djangocon.eu won’t.

You should prefer the static template tag, but if you need more control over exactly where and how STATIC_URL is injected into the template, you can use the get_static_prefix template tag:

If you are chaining filters, a filter applied after safe can make the contents unsafe again. For example, the following code prints the variable as is, unescaped:

ISO 8601 format. (Note: unlike other formatters, such as “Z”, “O” or “r”, the “c” formatter will not add timezone offset if value is a naive datetime (see datetime.tzinfo).

The time filter will only accept parameters in the format string that relate to the time of day, not the date. If you need to format a date value, use the date filter instead (or along with time if you need to render a full datetime value).

Resets a previous cycle so that it restarts from its first item at its next encounter. Without arguments, {% resetcycle %} will reset the last {% cycle %} defined in the template.

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For example, suppose you have a view, app_views.client, whose URLconf takes a client ID (here, client() is a method inside the views file app_views.py). The URLconf line might look like this:

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:

If my_list is ["red", "blue"], the output will be ?color=red&color=blue, preserving the list structure in the query string.

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.items will return data['items'] instead of data.items(). 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.

The only exceptions are variables already marked as “safe” from escaping. Variables could be marked as “safe” by the code which populated the variable, by applying the safe or escape filters, or because it’s the result of a previous filter that marked the string as “safe”.

Django provides template tags and filters to control each aspect of internationalization in templates. They allow for granular control of translations, formatting, and time zone conversions.

Applying escape to a variable that would normally have auto-escaping applied to the result will only result in one round of escaping being done. So it is safe to use this function even in auto-escaping environments. If you want multiple escaping passes to be applied, use the force_escape filter.

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Similar to truncatewords, except that it is aware of HTML tags. Any tags that are opened in the string and not closed before the truncation point, are closed immediately after the truncation.

Outputs a whole load of debugging information, including the current context and imported modules. {% debug %} outputs nothing when the DEBUG setting is False.

Additionally, the variable may be an iterable of template names, in which case the first that can be loaded will be used, as per select_template().

Links can have trailing punctuation (periods, commas, close-parens) and leading punctuation (opening parens), and urlize will still do the right thing.

Notice how the first block ends with class="odd" and the new one starts with class="odd". Without the {% resetcycle %} tag, the second block would start with class="even".

Given a whole number, returns the requested digit, where 1 is the right-most digit, 2 is the second-right-most digit, etc. Returns the original value for invalid input (if input or argument is not an integer, or if argument is less than 1). Otherwise, output is always an integer.