This document covers all stable modules in django.utils
. Most of the modules in django.utils
are designed for internal use and only the following parts can be considered stable and thus backwards compatible as per the internal release deprecation policy.
django.utils.cache
This module contains helper functions for controlling caching. It does so by managing the Vary
header of responses. It includes functions to patch the header of response objects directly and decorators that change functions to do that header-patching themselves.
For information on the Vary
header, see RFC 7231#section-7.1.4.
Essentially, the Vary
HTTP header defines which headers a cache should take into account when building its cache key. Requests with the same path but different header content for headers named in Vary
need to get different cache keys to prevent delivery of wrong content.
For example, internationalization middleware would need to distinguish caches by the Accept-language
header.
patch_cache_control(response, **kwargs)
[source]
This function patches the Cache-Control
header by adding all keyword arguments to it. The transformation is as follows:
True
(exactly True
, not just a true value), only the parameter name is added to the header.str()
to it.get_max_age(response)
[source]
Returns the max-age from the response Cache-Control header as an integer (or None
if it wasn’t found or wasn’t an integer).
patch_response_headers(response, cache_timeout=None)
[source]
Adds some useful headers to the given HttpResponse
object:
ETag
Expires
Cache-Control
Each header is only added if it isn’t already set.
cache_timeout
is in seconds. The CACHE_MIDDLEWARE_SECONDS
setting is used by default.
In older versions, the Last-Modified
header was also set.
Deprecated since version 1.11: Since the USE_ETAGS
setting is deprecated, this function won’t set the ETag
header when the deprecation ends in Django 2.1.
add_never_cache_headers(response)
[source]
Adds a Cache-Control: max-age=0, no-cache, no-store, must-revalidate
header to a response to indicate that a page should never be cached.
patch_vary_headers(response, newheaders)
[source]
Adds (or updates) the Vary
header in the given HttpResponse
object. newheaders
is a list of header names that should be in Vary
. Existing headers in Vary
aren’t removed.
get_cache_key(request, key_prefix=None)
[source]
Returns a cache key based on the request path. It can be used in the request phase because it pulls the list of headers to take into account from the global path registry and uses those to build a cache key to check against.
If there is no headerlist stored, the page needs to be rebuilt, so this function returns None
.
learn_cache_key(request, response, cache_timeout=None, key_prefix=None)
[source]
Learns what headers to take into account for some request path from the response object. It stores those headers in a global path registry so that later access to that path will know what headers to take into account without building the response object itself. The headers are named in the Vary
header of the response, but we want to prevent response generation.
The list of headers to use for cache key generation is stored in the same cache as the pages themselves. If the cache ages some data out of the cache, this just means that we have to build the response once to get at the Vary header and so at the list of headers to use for the cache key.
django.utils.dateparse
The functions defined in this module share the following properties:
ValueError
if their input is well formatted but isn’t a valid date or time.None
if it isn’t well formatted at all.parse_date(value)
[source]
Parses a string and returns a datetime.date
.
parse_time(value)
[source]
Parses a string and returns a datetime.time
.
UTC offsets aren’t supported; if value
describes one, the result is None
.
parse_datetime(value)
[source]
Parses a string and returns a datetime.datetime
.
UTC offsets are supported; if value
describes one, the result’s tzinfo
attribute is a FixedOffset
instance.
parse_duration(value)
[source]
Parses a string and returns a datetime.timedelta
.
Expects data in the format "DD HH:MM:SS.uuuuuu"
or as specified by ISO 8601 (e.g. P4DT1H15M20S
which is equivalent to 4 1:15:20
).
django.utils.decorators
method_decorator(decorator, name='')
[source]
Converts a function decorator into a method decorator. It can be used to decorate methods or classes; in the latter case, name
is the name of the method to be decorated and is required.
decorator
may also be a list or tuple of functions. They are wrapped in reverse order so that the call order is the order in which the functions appear in the list/tuple.
See decorating class based views for example usage.
decorator_from_middleware(middleware_class)
[source]
Given a middleware class, returns a view decorator. This lets you use middleware functionality on a per-view basis. The middleware is created with no params passed.
It assumes middleware that’s compatible with the old style of Django 1.9 and earlier (having methods like process_request()
, process_exception()
, and process_response()
).
decorator_from_middleware_with_args(middleware_class)
[source]
Like decorator_from_middleware
, but returns a function that accepts the arguments to be passed to the middleware_class. For example, the cache_page()
decorator is created from the CacheMiddleware
like this:
cache_page = decorator_from_middleware_with_args(CacheMiddleware) @cache_page(3600) def my_view(request): pass
django.utils.encoding
python_2_unicode_compatible()
[source]
A decorator that defines __unicode__
and __str__
methods under Python 2. Under Python 3 it does nothing.
To support Python 2 and 3 with a single code base, define a __str__
method returning text (use six.text_type()
if you’re doing some casting) and apply this decorator to the class.
smart_text(s, encoding='utf-8', strings_only=False, errors='strict')
[source]
Returns a text object representing s
– unicode
on Python 2 and str
on Python 3. Treats bytestrings using the encoding
codec.
If strings_only
is True
, don’t convert (some) non-string-like objects.
smart_unicode(s, encoding='utf-8', strings_only=False, errors='strict')
Historical name of smart_text()
. Only available under Python 2.
is_protected_type(obj)
[source]
Determine if the object instance is of a protected type.
Objects of protected types are preserved as-is when passed to force_text(strings_only=True)
.
force_text(s, encoding='utf-8', strings_only=False, errors='strict')
[source]
Similar to smart_text
, except that lazy instances are resolved to strings, rather than kept as lazy objects.
If strings_only
is True
, don’t convert (some) non-string-like objects.
force_unicode(s, encoding='utf-8', strings_only=False, errors='strict')
Historical name of force_text()
. Only available under Python 2.
smart_bytes(s, encoding='utf-8', strings_only=False, errors='strict')
[source]
Returns a bytestring version of s
, encoded as specified in encoding
.
If strings_only
is True
, don’t convert (some) non-string-like objects.
force_bytes(s, encoding='utf-8', strings_only=False, errors='strict')
[source]
Similar to smart_bytes
, except that lazy instances are resolved to bytestrings, rather than kept as lazy objects.
If strings_only
is True
, don’t convert (some) non-string-like objects.
smart_str(s, encoding='utf-8', strings_only=False, errors='strict')
Alias of smart_bytes()
on Python 2 and smart_text()
on Python 3. This function returns a str
or a lazy string.
For instance, this is suitable for writing to sys.stdout
on Python 2 and 3.
force_str(s, encoding='utf-8', strings_only=False, errors='strict')
Alias of force_bytes()
on Python 2 and force_text()
on Python 3. This function always returns a str
.
iri_to_uri(iri)
[source]
Convert an Internationalized Resource Identifier (IRI) portion to a URI portion that is suitable for inclusion in a URL.
This is the algorithm from section 3.1 of RFC 3987#section-3.1. However, since we are assuming input is either UTF-8 or unicode already, we can simplify things a little from the full method.
Takes an IRI in UTF-8 bytes and returns ASCII bytes containing the encoded result.
uri_to_iri(uri)
[source]
Converts a Uniform Resource Identifier into an Internationalized Resource Identifier.
This is an algorithm from section 3.2 of RFC 3987#section-3.2.
Takes a URI in ASCII bytes and returns a unicode string containing the encoded result.
filepath_to_uri(path)
[source]
Convert a file system path to a URI portion that is suitable for inclusion in a URL. The path is assumed to be either UTF-8 or unicode.
This method will encode certain characters that would normally be recognized as special characters for URIs. Note that this method does not encode the ‘ character, as it is a valid character within URIs. See encodeURIComponent()
JavaScript function for more details.
Returns an ASCII string containing the encoded result.
escape_uri_path(path)
[source]
Escapes the unsafe characters from the path portion of a Uniform Resource Identifier (URI).
django.utils.feedgenerator
Sample usage:
>>> from django.utils import feedgenerator >>> feed = feedgenerator.Rss201rev2Feed( ... title="Poynter E-Media Tidbits", ... link="http://www.poynter.org/column.asp?id=31", ... description="A group Weblog by the sharpest minds in online media/journalism/publishing.", ... language="en", ... ) >>> feed.add_item( ... title="Hello", ... link="http://www.holovaty.com/test/", ... description="Testing.", ... ) >>> with open('test.rss', 'w') as fp: ... feed.write(fp, 'utf-8')
For simplifying the selection of a generator use feedgenerator.DefaultFeed
which is currently Rss201rev2Feed
For definitions of the different versions of RSS, see: https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004/02/04/incompatible-rss
get_tag_uri(url, date)
[source]
Creates a TagURI.
See https://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id
SyndicationFeed
class SyndicationFeed
[source]
Base class for all syndication feeds. Subclasses should provide write().
__init__(title, link, description, language=None, author_email=None, author_name=None, author_link=None, subtitle=None, categories=None, feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs)
[source]
Initialize the feed with the given dictionary of metadata, which applies to the entire feed.
Any extra keyword arguments you pass to __init__
will be stored in self.feed
.
All parameters should be Unicode objects, except categories
, which should be a sequence of Unicode objects.
add_item(title, link, description, author_email=None, author_name=None, author_link=None, pubdate=None, comments=None, unique_id=None, enclosure=None, categories=(), item_copyright=None, ttl=None, updateddate=None, enclosures=None, **kwargs)
[source]
Adds an item to the feed. All args are expected to be Python unicode
objects except pubdate
and updateddate
, which are datetime.datetime
objects, enclosure
, which is an Enclosure
instance, and enclosures
, which is a list of Enclosure
instances.
Deprecated since version 1.9: The enclosure
keyword argument is deprecated in favor of the new enclosures
keyword argument which accepts a list of Enclosure
objects.
num_items()
[source]
root_attributes()
[source]
Return extra attributes to place on the root (i.e. feed/channel) element. Called from write()
.
add_root_elements(handler)
[source]
Add elements in the root (i.e. feed/channel) element. Called from write()
.
item_attributes(item)
[source]
Return extra attributes to place on each item (i.e. item/entry) element.
add_item_elements(handler, item)
[source]
Add elements on each item (i.e. item/entry) element.
write(outfile, encoding)
[source]
Outputs the feed in the given encoding to outfile
, which is a file-like object. Subclasses should override this.
writeString(encoding)
[source]
Returns the feed in the given encoding as a string.
latest_post_date()
[source]
Returns the latest pubdate
or updateddate
for all items in the feed. If no items have either of these attributes this returns the current UTC date/time.
In older versions, it returned the current date/time without any timezone information.
Enclosure
class Enclosure
[source]
Represents an RSS enclosure
RssFeed
class RssFeed(SyndicationFeed)
[source]
Rss201rev2Feed
class Rss201rev2Feed(RssFeed)
[source]
RssUserland091Feed
class RssUserland091Feed(RssFeed)
[source]
Atom1Feed
class Atom1Feed(SyndicationFeed)
[source]
django.utils.functional
class cached_property(object, name)
[source]
The @cached_property
decorator caches the result of a method with a single self
argument as a property. The cached result will persist as long as the instance does, so if the instance is passed around and the function subsequently invoked, the cached result will be returned.
Consider a typical case, where a view might need to call a model’s method to perform some computation, before placing the model instance into the context, where the template might invoke the method once more:
# the model class Person(models.Model): def friends(self): # expensive computation ... return friends # in the view: if person.friends(): ...
And in the template you would have:
{% for friend in person.friends %}
Here, friends()
will be called twice. Since the instance person
in the view and the template are the same, decorating the friends()
method with @cached_property
can avoid that:
from django.utils.functional import cached_property class Person(models.Model): @cached_property def friends(self): ...
Note that as the method is now a property, in Python code it will need to be invoked appropriately:
# in the view: if person.friends: ...
The cached value can be treated like an ordinary attribute of the instance:
# clear it, requiring re-computation next time it's called del person.friends # or delattr(person, "friends") # set a value manually, that will persist on the instance until cleared person.friends = ["Huckleberry Finn", "Tom Sawyer"]
As well as offering potential performance advantages, @cached_property
can ensure that an attribute’s value does not change unexpectedly over the life of an instance. This could occur with a method whose computation is based on datetime.now()
, or simply if a change were saved to the database by some other process in the brief interval between subsequent invocations of a method on the same instance.
You can use the name
argument to make cached properties of other methods. For example, if you had an expensive get_friends()
method and wanted to allow calling it without retrieving the cached value, you could write:
friends = cached_property(get_friends, name='friends')
While person.get_friends()
will recompute the friends on each call, the value of the cached property will persist until you delete it as described above:
x = person.friends # calls first time y = person.get_friends() # calls again z = person.friends # does not call x is z # is True
allow_lazy(func, *resultclasses)
[source]
Deprecated since version 1.10.
Works like keep_lazy()
except that it can’t be used as a decorator.
keep_lazy(func, *resultclasses)
[source]
Django offers many utility functions (particularly in django.utils
) that take a string as their first argument and do something to that string. These functions are used by template filters as well as directly in other code.
If you write your own similar functions and deal with translations, you’ll face the problem of what to do when the first argument is a lazy translation object. You don’t want to convert it to a string immediately, because you might be using this function outside of a view (and hence the current thread’s locale setting will not be correct).
For cases like this, use the django.utils.functional.keep_lazy()
decorator. It modifies the function so that if it’s called with a lazy translation as one of its arguments, the function evaluation is delayed until it needs to be converted to a string.
For example:
from django.utils import six from django.utils.functional import keep_lazy, keep_lazy_text def fancy_utility_function(s, ...): # Do some conversion on string 's' ... fancy_utility_function = keep_lazy(six.text_type)(fancy_utility_function) # Or more succinctly: @keep_lazy(six.text_type) def fancy_utility_function(s, ...): ...
The keep_lazy()
decorator takes a number of extra arguments (*args
) specifying the type(s) that the original function can return. A common use case is to have functions that return text. For these, you can just pass the six.text_type
type to keep_lazy
(or even simpler, use the keep_lazy_text()
decorator described in the next section).
Using this decorator means you can write your function and assume that the input is a proper string, then add support for lazy translation objects at the end.
keep_lazy_text(func)
[source]
A shortcut for keep_lazy(six.text_type)(func)
.
If you have a function that returns text and you want to be able to take lazy arguments while delaying their evaluation, simply use this decorator:
from django.utils import six from django.utils.functional import keep_lazy, keep_lazy_text # Our previous example was: @keep_lazy(six.text_type) def fancy_utility_function(s, ...): ... # Which can be rewritten as: @keep_lazy_text def fancy_utility_function(s, ...): ...
django.utils.html
Usually you should build up HTML using Django’s templates to make use of its autoescape mechanism, using the utilities in django.utils.safestring
where appropriate. This module provides some additional low level utilities for escaping HTML.
escape(text)
[source]
Returns the given text with ampersands, quotes and angle brackets encoded for use in HTML. The input is first passed through force_text()
and the output has mark_safe()
applied.
conditional_escape(text)
[source]
Similar to escape()
, except that it doesn’t operate on pre-escaped strings, so it will not double escape.
format_html(format_string, *args, **kwargs)
[source]
This is similar to str.format()
, except that it is appropriate for building up HTML fragments. All args and kwargs are passed through conditional_escape()
before being passed to str.format()
.
For the case of building up small HTML fragments, this function is to be preferred over string interpolation using %
or str.format()
directly, because it applies escaping to all arguments - just like the template system applies escaping by default.
So, instead of writing:
mark_safe("%s <b>%s</b> %s" % ( some_html, escape(some_text), escape(some_other_text), ))
You should instead use:
format_html("{} <b>{}</b> {}", mark_safe(some_html), some_text, some_other_text, )
This has the advantage that you don’t need to apply escape()
to each argument and risk a bug and an XSS vulnerability if you forget one.
Note that although this function uses str.format()
to do the interpolation, some of the formatting options provided by str.format()
(e.g. number formatting) will not work, since all arguments are passed through conditional_escape()
which (ultimately) calls force_text()
on the values.
format_html_join(sep, format_string, args_generator)
[source]
A wrapper of format_html()
, for the common case of a group of arguments that need to be formatted using the same format string, and then joined using sep
. sep
is also passed through conditional_escape()
.
args_generator
should be an iterator that returns the sequence of args
that will be passed to format_html()
. For example:
format_html_join( '\n', "<li>{} {}</li>", ((u.first_name, u.last_name) for u in users) )
Tries to remove anything that looks like an HTML tag from the string, that is anything contained within <>
.
Absolutely NO guarantee is provided about the resulting string being HTML safe. So NEVER mark safe the result of a strip_tag
call without escaping it first, for example with escape()
.
For example:
strip_tags(value)
If value
is "<b>Joel</b> <button>is</button> a <span>slug</span>"
the return value will be "Joel is a slug"
.
If you are looking for a more robust solution, take a look at the bleach Python library.
html_safe()
[source]
The __html__()
method on a class helps non-Django templates detect classes whose output doesn’t require HTML escaping.
This decorator defines the __html__()
method on the decorated class by wrapping the __unicode__()
(Python 2) or __str__()
(Python 3) in mark_safe()
. Ensure the __unicode__()
or __str__()
method does indeed return text that doesn’t require HTML escaping.
django.utils.http
urlquote(url, safe='/')
[source]
A version of Python’s urllib.quote()
function that can operate on unicode strings. The url is first UTF-8 encoded before quoting. The returned string can safely be used as part of an argument to a subsequent iri_to_uri()
call without double-quoting occurring. Employs lazy execution.
urlquote_plus(url, safe='')
[source]
A version of Python’s urllib.quote_plus() function that can operate on unicode strings. The url is first UTF-8 encoded before quoting. The returned string can safely be used as part of an argument to a subsequent iri_to_uri()
call without double-quoting occurring. Employs lazy execution.
urlencode(query, doseq=0)
[source]
A version of Python’s urllib.urlencode() function that can operate on unicode strings. The parameters are first cast to UTF-8 encoded strings and then encoded as per normal.
Formats the time to ensure compatibility with Netscape’s cookie standard.
Accepts a floating point number expressed in seconds since the epoch in UTC–such as that outputted by time.time()
. If set to None
, defaults to the current time.
Outputs a string in the format Wdy, DD-Mon-YYYY HH:MM:SS GMT
.
http_date(epoch_seconds=None)
[source]
Formats the time to match the RFC 1123 date format as specified by HTTP RFC 7231#section-7.1.1.1.
Accepts a floating point number expressed in seconds since the epoch in UTC–such as that outputted by time.time()
. If set to None
, defaults to the current time.
Outputs a string in the format Wdy, DD Mon YYYY HH:MM:SS GMT
.
base36_to_int(s)
[source]
Converts a base 36 string to an integer. On Python 2 the output is guaranteed to be an int
and not a long
.
int_to_base36(i)
[source]
Converts a positive integer to a base 36 string. On Python 2 i
must be smaller than sys.maxint.
urlsafe_base64_encode(s)
[source]
Encodes a bytestring in base64 for use in URLs, stripping any trailing equal signs.
urlsafe_base64_decode(s)
[source]
Decodes a base64 encoded string, adding back any trailing equal signs that might have been stripped.
django.utils.module_loading
Functions for working with Python modules.
import_string(dotted_path)
[source]
Imports a dotted module path and returns the attribute/class designated by the last name in the path. Raises ImportError
if the import failed. For example:
from django.utils.module_loading import import_string ValidationError = import_string('django.core.exceptions.ValidationError')
is equivalent to:
from django.core.exceptions import ValidationError
django.utils.safestring
Functions and classes for working with “safe strings”: strings that can be displayed safely without further escaping in HTML. Marking something as a “safe string” means that the producer of the string has already turned characters that should not be interpreted by the HTML engine (e.g. ‘<’) into the appropriate entities.
class SafeBytes
[source]
A bytes
subclass that has been specifically marked as “safe” (requires no further escaping) for HTML output purposes.
class SafeString
A str
subclass that has been specifically marked as “safe” (requires no further escaping) for HTML output purposes. This is SafeBytes
on Python 2 and SafeText
on Python 3.
class SafeText
[source]
A str
(in Python 3) or unicode
(in Python 2) subclass that has been specifically marked as “safe” for HTML output purposes.
class SafeUnicode
Historical name of SafeText
. Only available under Python 2.
mark_safe(s)
[source]
Explicitly mark a string as safe for (HTML) output purposes. The returned object can be used everywhere a string or unicode object is appropriate.
Can be called multiple times on a single string.
Can also be used as a decorator.
For building up fragments of HTML, you should normally be using django.utils.html.format_html()
instead.
String marked safe will become unsafe again if modified. For example:
>>> mystr = '<b>Hello World</b> ' >>> mystr = mark_safe(mystr) >>> type(mystr) <class 'django.utils.safestring.SafeBytes'> >>> mystr = mystr.strip() # removing whitespace >>> type(mystr) <type 'str'>
Added support for decorator usage.
mark_for_escaping(s)
[source]
Deprecated since version 1.10.
Explicitly mark a string as requiring HTML escaping upon output. Has no effect on SafeData
subclasses.
Can be called multiple times on a single string (the resulting escaping is only applied once).
django.utils.text
format_lazy(format_string, *args, **kwargs)
A version of str.format()
for when format_string
, args
, and/or kwargs
contain lazy objects. The first argument is the string to be formatted. For example:
from django.utils.text import format_lazy from django.utils.translation import pgettext_lazy urlpatterns = [ url(format_lazy(r'{person}/(?P<pk>\d+)/$', person=pgettext_lazy('URL', 'person')), PersonDetailView.as_view()), ]
This example allows translators to translate part of the URL. If “person” is translated to “persona”, the regular expression will match persona/(?P<pk>\d+)/$
, e.g. persona/5/
.
slugify(allow_unicode=False)
[source]
Converts to ASCII if allow_unicode
is False
(default). Converts spaces to hyphens. Removes characters that aren’t alphanumerics, underscores, or hyphens. Converts to lowercase. Also strips leading and trailing whitespace.
For example:
slugify(value)
If value
is "Joel is a slug"
, the output will be "joel-is-a-slug"
.
You can set the allow_unicode
parameter to True
, if you want to allow Unicode characters:
slugify(value, allow_unicode=True)
If value
is "你好 World"
, the output will be "你好-world"
.
django.utils.timezone
utc
tzinfo
instance that represents UTC.
class FixedOffset(offset=None, name=None)
[source]
A tzinfo
subclass modeling a fixed offset from UTC. offset
is an integer number of minutes east of UTC.
get_fixed_timezone(offset)
[source]
Returns a tzinfo
instance that represents a time zone with a fixed offset from UTC.
offset
is a datetime.timedelta
or an integer number of minutes. Use positive values for time zones east of UTC and negative values for west of UTC.
get_default_timezone()
[source]
Returns a tzinfo
instance that represents the default time zone.
get_default_timezone_name()
[source]
Returns the name of the default time zone.
get_current_timezone()
[source]
Returns a tzinfo
instance that represents the current time zone.
get_current_timezone_name()
[source]
Returns the name of the current time zone.
activate(timezone)
[source]
Sets the current time zone. The timezone
argument must be an instance of a tzinfo
subclass or a time zone name.
deactivate()
[source]
Unsets the current time zone.
override(timezone)
[source]
This is a Python context manager that sets the current time zone on entry with activate()
, and restores the previously active time zone on exit. If the timezone
argument is None
, the current time zone is unset on entry with deactivate()
instead.
override
is also usable as a function decorator.
localtime(value=None, timezone=None)
[source]
Converts an aware datetime
to a different time zone, by default the current time zone.
When value
is omitted, it defaults to now()
.
This function doesn’t work on naive datetimes; use make_aware()
instead.
In older versions, value
is a required argument.
localdate(value=None, timezone=None)
[source]
Uses localtime()
to convert an aware datetime
to a date()
in a different time zone, by default the current time zone.
When value
is omitted, it defaults to now()
.
This function doesn’t work on naive datetimes.
now()
[source]
Returns a datetime
that represents the current point in time. Exactly what’s returned depends on the value of USE_TZ
:
USE_TZ
is False
, this will be a naive datetime (i.e. a datetime without an associated timezone) that represents the current time in the system’s local timezone.USE_TZ
is True
, this will be an aware datetime representing the current time in UTC. Note that now()
will always return times in UTC regardless of the value of TIME_ZONE
; you can use localtime()
to convert to a time in the current time zone.is_aware(value)
[source]
Returns True
if value
is aware, False
if it is naive. This function assumes that value
is a datetime
.
is_naive(value)
[source]
Returns True
if value
is naive, False
if it is aware. This function assumes that value
is a datetime
.
make_aware(value, timezone=None, is_dst=None)
[source]
Returns an aware datetime
that represents the same point in time as value
in timezone
, value
being a naive datetime
. If timezone
is set to None
, it defaults to the current time zone.
The pytz.AmbiguousTimeError
exception is raised if you try to make value
aware during a DST transition where the same time occurs twice (when reverting from DST). Setting is_dst
to True
or False
will avoid the exception by choosing if the time is pre-transition or post-transition respectively.
The pytz.NonExistentTimeError
exception is raised if you try to make value
aware during a DST transition such that the time never occurred (when entering into DST). Setting is_dst
to True
or False
will avoid the exception by moving the hour backwards or forwards by 1 respectively. For example, is_dst=True
would change a non-existent time of 2:30 to 1:30 and is_dst=False
would change the time to 3:30.
make_naive(value, timezone=None)
[source]
Returns an naive datetime
that represents in timezone
the same point in time as value
, value
being an aware datetime
. If timezone
is set to None
, it defaults to the current time zone.
django.utils.translation
For a complete discussion on the usage of the following see the translation documentation.
gettext(message)
[source]
Translates message
and returns it in a UTF-8 bytestring
ugettext(message)
[source]
Translates message
and returns it in a unicode string
pgettext(context, message)
[source]
Translates message
given the context
and returns it in a unicode string.
For more information, see Contextual markers.
gettext_lazy(message)
ugettext_lazy(message)
pgettext_lazy(context, message)
Same as the non-lazy versions above, but using lazy execution.
gettext_noop(message)
[source]
ugettext_noop(message)
Marks strings for translation but doesn’t translate them now. This can be used to store strings in global variables that should stay in the base language (because they might be used externally) and will be translated later.
ngettext(singular, plural, number)
[source]
Translates singular
and plural
and returns the appropriate string based on number
in a UTF-8 bytestring.
ungettext(singular, plural, number)
[source]
Translates singular
and plural
and returns the appropriate string based on number
in a unicode string.
npgettext(context, singular, plural, number)
[source]
Translates singular
and plural
and returns the appropriate string based on number
and the context
in a unicode string.
ngettext_lazy(singular, plural, number)
[source]
ungettext_lazy(singular, plural, number)
[source]
npgettext_lazy(context, singular, plural, number)
[source]
Same as the non-lazy versions above, but using lazy execution.
string_concat(*strings)
Deprecated since version 1.11: Use django.utils.text.format_lazy()
instead. string_concat(*strings)
can be replaced by format_lazy('{}' * len(strings), *strings)
.
Lazy variant of string concatenation, needed for translations that are constructed from multiple parts.
activate(language)
[source]
Fetches the translation object for a given language and activates it as the current translation object for the current thread.
deactivate()
[source]
Deactivates the currently active translation object so that further _ calls will resolve against the default translation object, again.
deactivate_all()
[source]
Makes the active translation object a NullTranslations()
instance. This is useful when we want delayed translations to appear as the original string for some reason.
override(language, deactivate=False)
[source]
A Python context manager that uses django.utils.translation.activate()
to fetch the translation object for a given language, activates it as the translation object for the current thread and reactivates the previous active language on exit. Optionally, it can simply deactivate the temporary translation on exit with django.utils.translation.deactivate()
if the deactivate
argument is True
. If you pass None
as the language argument, a NullTranslations()
instance is activated within the context.
override
is also usable as a function decorator.
check_for_language(lang_code)
[source]
Checks whether there is a global language file for the given language code (e.g. ‘fr’, ‘pt_BR’). This is used to decide whether a user-provided language is available.
get_language()
[source]
Returns the currently selected language code. Returns None
if translations are temporarily deactivated (by deactivate_all()
or when None
is passed to override()
).
get_language_bidi()
[source]
Returns selected language’s BiDi layout:
False
= left-to-right layoutTrue
= right-to-left layoutget_language_from_request(request, check_path=False)
[source]
Analyzes the request to find what language the user wants the system to show. Only languages listed in settings.LANGUAGES are taken into account. If the user requests a sublanguage where we have a main language, we send out the main language.
If check_path
is True
, the function first checks the requested URL for whether its path begins with a language code listed in the LANGUAGES
setting.
to_locale(language)
[source]
Turns a language name (en-us) into a locale name (en_US).
templatize(src)
[source]
Turns a Django template into something that is understood by xgettext
. It does so by translating the Django translation tags into standard gettext
function invocations.
LANGUAGE_SESSION_KEY
Session key under which the active language for the current session is stored.
© Django Software Foundation and individual contributors
Licensed under the BSD License.
https://docs.djangoproject.com/en/1.11/ref/utils/