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choicesenum-0.7.0
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Python's Enum with extra powers to play nice with labels and choices fields
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | choicesenum-0.7.0 |
| نام | choicesenum |
| نسخه کتابخانه | 0.7.0 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Fernando Macedo |
| ایمیل نویسنده | fgmacedo@gmail.com |
| آدرس صفحه اصلی | https://github.com/loggi/python-choicesenum |
| آدرس اینترنتی | https://pypi.org/project/choicesenum/ |
| مجوز | BSD license |
============
Choices Enum
============
.. image:: https://img.shields.io/pypi/v/choicesenum.svg
:target: https://pypi.python.org/pypi/choicesenum
.. image:: https://travis-ci.org/loggi/python-choicesenum.svg?branch=master
:target: https://travis-ci.org/loggi/python-choicesenum
.. image:: https://readthedocs.org/projects/python-choicesenum/badge/?version=latest
:target: https://python-choicesenum.readthedocs.io/en/latest/?badge=latest
:alt: Documentation Status
.. image:: https://coveralls.io/repos/github/loggi/python-choicesenum/badge.svg?branch=master
:target: https://coveralls.io/github/loggi/python-choicesenum?branch=master
Python's Enum with extra powers to play nice with labels and choices fields.
* Free software: BSD license
* Documentation: https://python-choicesenum.readthedocs.io.
------------
Installation
------------
Install ``choicesenum`` using pip::
$ pip install choicesenum
--------
Features
--------
* An ``ChoicesEnum`` that can be used to create constant groups.
* ``ChoicesEnum`` can define labels to be used in `choices` fields.
* Django fields included: ``EnumCharField`` and ``EnumIntegerField``.
* All ``ChoicesEnum`` types can be compared against their primitive values directly.
* Support (tested) for Python 2.7, 3.5, 3.6, 3.7 and 3.8.
* Support (tested) for Django 1.9, 1.10, 1.11, 2.0, 2.1, 2.2 and 3.0.
--------------
Usage examples
--------------
Example with ``HttpStatuses``:
.. code:: python
class HttpStatuses(ChoicesEnum):
OK = 200
BAD_REQUEST = 400
UNAUTHORIZED = 401
FORBIDDEN = 403
Example with ``Colors``:
.. code:: python
from choicesenum import ChoicesEnum
class Colors(ChoicesEnum):
RED = '#f00', 'Vermelho'
GREEN = '#0f0', 'Verde'
BLUE = '#00f', 'Azul'
Comparison
----------
All `Enum` types can be compared against their values:
.. code:: python
assert HttpStatuses.OK == 200
assert HttpStatuses.BAD_REQUEST == 400
assert HttpStatuses.UNAUTHORIZED == 401
assert HttpStatuses.FORBIDDEN == 403
status_code = HttpStatuses.OK
assert 200 <= status_code <= 300
assert Colors.RED == '#f00'
assert Colors.GREEN == '#0f0'
assert Colors.BLUE == '#00f'
Label for free
--------------
All `Enum` types have by default a `display` derived from the enum identifier:
.. code:: python
assert HttpStatuses.OK.display == 'Ok'
assert HttpStatuses.BAD_REQUEST.display == 'Bad request'
assert HttpStatuses.UNAUTHORIZED.display == 'Unauthorized'
assert HttpStatuses.FORBIDDEN.display == 'Forbidden'
You can easily define your own custom display for an `Enum` item using a tuple:
.. code:: python
class HttpStatuses(ChoicesEnum):
OK = 200, 'Everything is fine'
BAD_REQUEST = 400, 'You did a mistake'
UNAUTHORIZED = 401, 'I know your IP'
FORBIDDEN = 403
assert HttpStatuses.OK.display == 'Everything is fine'
assert HttpStatuses.BAD_REQUEST.display == 'You did a mistake'
assert HttpStatuses.UNAUTHORIZED.display == 'I know your IP'
assert HttpStatuses.FORBIDDEN.display == 'Forbidden'
Dynamic properties
------------------
For each enum item, a dynamic property ``is_<enum_item>`` is generated to allow
quick boolean checks:
.. code:: python
color = Colors.RED
assert color.is_red
assert not color.is_blue
assert not color.is_green
This feature is usefull to avoid comparing a received enum value against a know enum item.
For example, you can replace code like this:
.. code:: python
# status = HttpStatuses.BAD_REQUEST
def check_status(status):
if status == HttpStatuses.OK:
print("Ok!")
To this:
.. code:: python
def check_status(status):
if status.is_ok:
print("Ok!")
Custom methods and properties
-----------------------------
You can declare custom properties and methods:
.. code:: python
class HttpStatuses(ChoicesEnum):
OK = 200, 'Everything is fine'
BAD_REQUEST = 400, 'You did a mistake'
UNAUTHORIZED = 401, 'I know your IP'
FORBIDDEN = 403
@property
def is_error(self):
return self >= self.BAD_REQUEST
assert HttpStatuses.OK.is_error is False
assert HttpStatuses.BAD_REQUEST.is_error is True
assert HttpStatuses.UNAUTHORIZED.is_error is True
Iteration
---------
The enum type is iterable:
.. code:: python
>>> for color in Colors:
... print(repr(color))
Color('#f00').RED
Color('#0f0').GREEN
Color('#00f').BLUE
Order is guaranteed only for py3.4+. For fixed order in py2.7, you
can implement a magic attribute ``_order_``:
.. code:: python
from choicesenum import ChoicesEnum
class Colors(ChoicesEnum):
_order_ = 'RED GREEN BLUE'
RED = '#f00', 'Vermelho'
GREEN = '#0f0', 'Verde'
BLUE = '#00f', 'Azul'
Choices
-------
Use ``.choices()`` method to receive a list of tuples ``(item, display)``:
.. code:: python
assert list(Colors.choices()) == [
('#f00', 'Vermelho'),
('#0f0', 'Verde'),
('#00f', 'Azul'),
]
Values
-------
Use ``.values()`` method to receive a list of the inner values:
.. code:: python
assert Colors.values() == ['#f00', '#0f0', '#00f', ]
Options
-------
Even if a ``ChoicesEnum`` class is an iterator by itself, you can use ``.options()`` to convert the enum items to a list:
.. code:: python
assert Colors.options() == [Colors.RED, Colors.GREEN, Colors.BLUE]
A "dict like" get
-----------------
Use ``.get(value, default=None)`` method to receive ``default`` if ``value`` is not an item of enum:
.. code:: python
assert Colors.get(Colors.RED) == Colors.RED
assert Colors.get('#f00') == Colors.RED
assert Colors.get('undefined_color') is None
assert Colors.get('undefined_color', Colors.RED) == Colors.RED
Compatibility
-------------
The enum item can be used whenever the value is needed:
.. code:: python
assert u'Currrent color is {c} ({c.display})'.format(c=color) ==\
u'Currrent color is #f00 (Vermelho)'
Even in dicts and sets, as it shares the same `hash()` from his value:
.. code:: python
d = {
HttpStatuses.OK.value: "using value",
HttpStatuses.BAD_REQUEST: "using enum",
401: "from original value",
}
assert d[HttpStatuses.OK] == "using value"
assert d[HttpStatuses.BAD_REQUEST.value] == "using enum"
assert d[HttpStatuses.OK] == d[HttpStatuses.OK.value]
assert d[HttpStatuses.UNAUTHORIZED] == d[401]
There's also optimistic casting of inner types:
.. code:: python
assert int(HttpStatuses.OK) == 200
assert float(HttpStatuses.OK) == 200.0
assert str(HttpStatuses.BAD_REQUEST) == "400"
Check membership:
.. code:: python
assert HttpStatuses.OK in HttpStatuses
assert 200 in HttpStatuses
assert 999 not in HttpStatuses
JSON
....
If you want json serialization, you have at least two options:
1. Patch the default serializer.
2. Write a custom JSONEncoder.
ChoicesEnum comes with a handy patch funtion, you need to add this
code to somewhere at the top of everything to automagically add
json serialization capabilities:
.. code:: python
from choicesenum.patches import patch_json
patch_json()
.. note::
Eventually ``__json__`` will be added to the stdlib, see
https://bugs.python.org/issue27362
------
Django
------
Fields
------
Usage with the custom Django fields:
.. code:: python
from django.db import models
from choicesenum.django.fields import EnumCharField
class ColorModel(models.Model):
color = EnumCharField(
max_length=100,
enum=Colors,
default=Colors.GREEN,
)
instance = ColorModel()
assert instance.color == Colors.GREEN
assert instance.color.is_green is True
assert instance.color.value == Colors.GREEN.value == '#0f0'
assert instance.color.display == Colors.GREEN.display
instance.color = '#f00'
assert instance.color == '#f00'
assert instance.color.value == '#f00'
assert instance.color.display == 'Vermelho'
Is guaranteed that the field value is *always* a `ChoicesEnum` item. Pay
attention that the field will only accept valid values for the ``Enum`` in use,
so if your field allow `null`, your enum should also:
.. code:: python
from django.db import models
from choicesenum import ChoicesEnum
from choicesenum.django.fields import EnumIntegerField
class UserStatus(ChoicesEnum):
UNDEFINED = None
PENDING = 1
ACTIVE = 2
INACTIVE = 3
DELETED = 4
class User(models.Model):
status = EnumIntegerField(enum=UserStatus, null=True, )
instance = User()
assert instance.status.is_undefined is True
assert instance.status.value is None
assert instance.status == UserStatus.UNDEFINED
assert instance.status.display == 'Undefined'
# again...
instance.status = None
assert instance.status.is_undefined is True
--------
Graphene
--------
Usage with Graphene_ Enums:
.. _Graphene: http://docs.graphene-python.org/en/latest/types/enums/#usage-with-python-enums
.. code:: python
UserStatusEnum = graphene.Enum.from_enum(UserStatus)
----------
Schematics
----------
Usage with Schematics_ Enums:
.. _Schematics: https://schematics.readthedocs.io/en/latest/usage/types.html
.. code:: python
from schematics.models import Model as SchematicModel
from schematics.types import StringType, DateTimeType
from choicesenum import ChoicesEnum
from choicesenum.schematics.types import ChoicesEnumType
class HttpStatus(ChoicesEnum):
OK = 200
BAD_REQUEST = 400
UNAUTHORIZED = 401
FORBIDDEN = 403
class CustomSchematicModel(SchematicModel):
name = StringType(required=True, max_length=255)
created = DateTimeType(required=True, formats=('%d/%m/%Y', ''))
http = ChoicesEnumType(HttpStatuses, required=True)
-------
History
-------
0.7.0 (2020-08-02)
------------------
* Add support Django 3.0 (tks @klette).
* Drop support for Python 3.4.
* Fix issue when using Django EnumIntegerField on Admin.
0.6.0 (2019-09-05)
------------------
* Adding schematics contrib type ChoicesEnumType.
* Drop support for Django 1.6, 1.7, 1.8.
0.5.3 (2019-02-06)
------------------
* Fix Django migrations with default values for Django 1.7+.
0.5.2 (2019-01-18)
------------------
* Optimize member check and dynamic creation of `is_<name>` properties.
0.5.1 (2019-01-04)
------------------
* Fix readme RST (requires new Pypi upload).
0.5.0 (2019-01-04)
------------------
* Membership test (item in Enum) returning valid results for primitive values.
* New dict-like `.get` method able to return a default value (thanks @leandrogs).
* Django: Support Postgres array functions and queries (thanks @tomfa).
* Django: Support for deferring an enum field using `queryset.defer()` (thanks @noamkush).
* Django: 2.1 support.
0.4.0 (2018-07-13)
------------------
* Optimistic casting of inner types (thanks @gabisurita).
* Optional stdlib patch to automagic json serialization support.
* Add Python3.7 to the test matrix.
0.3.0 (2018-06-22)
------------------
* Official Django 2.0 support (0.2.2 just works fine too).
* ``ChoicesEnum`` sharing the same hash() as his value. Can be used to retrieve/restore items in dicts (`d[enum] == d[enum.value]`).
0.2.2 (2017-12-01)
------------------
* Fix: Support queries through `select_related` with no `None` value defined (thanks @klette).
0.2.1 (2017-09-30)
------------------
* Fix South migrations for Django 1.6.
0.2.0 (2017-09-11)
------------------
* ``ChoicesEnum`` items are comparable by their values (==, !=, >, >=, <, <=) (thanks @jodal).
* +``ChoicesEnum.values``: Returns all the Enum's raw values (eq: ``[x.value for x in Enum]``).
0.1.7 (2017-09-10)
------------------
* Fix: ``ChoicesEnum`` is now hashable (thanks @jodal).
0.1.6 (2017-09-08)
------------------
* Fix: Proxy ``__len__`` calls to the inner enum value.
0.1.5 (2017-09-05)
------------------
* +ChoicesEnum.description: Alias for `label`, allow enum descriptors to be used by Graphene.
0.1.4 (2017-08-28)
------------------
* Fix South migrations for Django 1.6.
* ``ChoicesEnum`` repr can be used to reconstruct an instance (``item == eval(repr(item))``).
0.1.3 (2017-08-28)
------------------
* Fix sdist not including sub-modules (django contrib).
0.1.2 (2017-08-27)
------------------
* README fixes and improvements.
0.1.0 (2017-08-27)
------------------
* First release on PyPI.
نیازمندی
| مقدار | نام |
|---|---|
| - | six |
| - | enum34 |
نحوه نصب
نصب پکیج whl choicesenum-0.7.0:
pip install choicesenum-0.7.0.whl
نصب پکیج tar.gz choicesenum-0.7.0:
pip install choicesenum-0.7.0.tar.gz