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Editor to share with you what features Django 2.0 version has, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

I. Python compatibility

Django 2.0 supports Python3.4, 3.5, and 3.6. Django officially recommends the latest version of each series.

The most important thing is that Django 2.0 no longer supports Python2!

Django 1.11.x is the last version that supports Python2.7.

II. 2.0 new features

1. Simplified URL routing syntax

The syntax of the django.urls.path () method is simpler.

For example, the previous:

Url (r'^ articles/ (? P [0-9] {4}) / $', views.year_archive)

You can write:

Path ('articles//', views.year_archive)

The new syntax supports the mandatory definition of parameter types. In the example, only integer year parameters are received, no string types are accepted, and the "10000" year is legal (although it is 5 digits), unlike the previous regular which only accepts 4 digits.

The previous version of the django.conf.urls.url () method became django.urls.re_path (), but for backward compatibility, the old one was retained rather than immediately discarded. The django.conf.urls.include () method can now be imported from django.urls, that is, you can use from django.urls import include, path, re_path.

2.admin background is more mobile friendly.

Django's most popular admin background, with responsive features, supports mainstream mobile devices.

3.Window expression

The new Window expression allows you to add an OVER clause to the query set.

4. Small characteristic

Django.contrib.admin background

The new ModelAdmin.autocomplete_fields property and the ModelAdmin.get_autocomplete_fields () method can now use the Select2 search box on foreign keys and many-to-many fields.

Django.contrib.auth user authentication

The number of iterations for the PBKDF2 password hash default increased from 36000 to 100000.

Django.contrib.gis Geographic Framework

Added MySQL support for AsGeoJSON, GeoHash and GeoHash methods, isvalid and distance queries

Add Azimuth and LineLocatePoint methods to support PostGIS and SpatiaLite

All GEOSGeometry imported from GeoJSON have SRID collections

Add an OSMWidget.default_zoom attribute to customize the default zoom level of the map

Metadata is now readable and editable

Allow creation of GDALRaster objects in GDAL's internal virtual file system

The new GDALBand.color_interp () method returns the color description of the band.

Django.contrib.postgres database

New distinct parameter for ArrayAgg

New RandomUUID function

Django.contrib.postgres.indexes.GinIndex now supports fastupdate and gin_pending_list_limit parameters

The new GistIndex class allows GiST indexes to be created in the database

Inspectdb can now introspect JSONField and RangeFields.

Django.contrib.sitemaps site map

Add protocol parameters to the GenericSitemap constructor

Cache caching

Cache.set_many () now returns a list of key values that failed to insert

File Storage file storage

File.open () can now be used for context managers, such as with file.open () as f:

Forms form

SplitDateTimeWidget and SplitHiddenDateTimeWidget add date_attrs and time_attrs parameters to specify HTML attributes for DateInput and TimeInput

The new Form.errors.get_json_data () method returns a form error of dictionary type to accommodate the JSON type x response

Generic Views Universal View

The new ContextMixin.extra_context property allows context to be added to View.as_view ()

Management Commands management command

Inspectdb now treats unsigned integers of MySQL as PositiveIntegerField or PositiveSmallIntegerField

Added makemessages-- add-location option

Loaddata can now be read from standard input

Added diffsettings-- output option

Migrations migration

Added squashmigrations-- squashed-name option

Models model

New StrIndex database function

For Oracle databases, AutoField and BigAutoField now generate identity columns

QuerySet.iterator () added chunk_size parameter

QuerySet.earliest (), QuerySet.latest (), and Meta.get_latest_by can now be sorted by some fields

Added ExtractQuarter method for DateField and DateTimeField

Added TruncQuarter method to intercept DateField and DateTimeField to the first day of the quarter

Add db_tablespace parameters for class-based indexes

Add the of parameter to QuerySet.select_for_update (), but only support PostgreSQL and Oracle databases

QuerySet.in_bulk () added field_name parameter

CursorWrapper.callproc () now receives the optional dictionary type keyword parameter

QuerySet.values_list () added a named parameter to get the named tuple result.

The new FilteredRelation class allows you to add an ON clause to the query set

Pagination paging

Add Paginator.get_page () to handle all kinds of illegal page parameters and prevent exceptions

Requests and Responses request and response

Runserver servers now support HTTP 1.1

Templates template

To improve the usefulness of Engine.get_default () in third-party modules, it will now return the first of several DjangoTemplates engines configured in TEMPLATES instead of popping up an ImproperlyConfigured error

Custom template tags now receive mandatory keyword parameters

Tests test

Add multithreading support for LiveServerTestCase

Validators verifier

The new ProhibitNullCharactersValidator does not allow form input for CharField and its subclasses to be empty

Third, important backward incompatibility

1. Delete support for bytestrings in some places

For example, for reverse (), now use str () instead of force_text ().

2. The maximum length of AbstractUser.last_name is increased to 150.

If you have a custom user model that inherits AbstractUser, you need to generate and apply a database migration to make the maximum length of last_name 150.

If you need to maintain a 30-character limit for last_name, you can use a custom form as follows:

From django.contrib.auth.forms import UserChangeFormclass MyUserChangeForm (UserChangeForm): last_name = forms.CharField (max_length=30, required=False)

If you need to maintain this constraint in admin, you can use UserAdmin.form as follows:

From django.contrib.auth.admin import UserAdminfrom django.contrib.auth.models import Userclass MyUserAdmin (UserAdmin): form = MyUserChangeFormadmin.site.unregister (User) admin.site.register (User, MyUserAdmin)

3. QuerySet.reverse () and last () cannot be used in sliced query sets.

Using inversion and getting the most recent object on the sliced query set will pop up an exception, as follows:

Model.objects.all () [: 2] .reverse () Traceback (most recent call last):... TypeError: Cannot reverse a query once a slice has been taken.

4. The fields of the form no longer receive optional parameters as location parameters

To prevent run-time errors and improve reliability. It used to be similar to the following parameter passing method, but now it is wrong:

Forms.IntegerField (25,10)

To pass on like this:

Forms.IntegerField (max_value=25, min_value=10)

5. Index no longer receives location parameters

For example, the following usage will cause an exception:

Models.Index (['headline','-pub_date'], 'index_name')

To provide a parameter keyword, rewrite it as:

Models.Index (fields= ['headline','-pub_date'], name='index_name')

6. Call_command () will verify the options it receives

For administrative commands that use options instead of parser.add_argument () for customization, you need to add a stealth_options attribute, as follows:

Class MyCommand (BaseCommand): stealth_options = ('option_name',...)

7. SQLite now supports foreign key constraints

In addition, Django2.0 discards and removes some methods and properties.

These are all the contents of this article entitled "what are the features of Django 2.0?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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