choice_enum 1.0.0

选项枚举

ChoiceEnumeration类可以在中的模块或类级别声明 以下格式：

class ChoiceClass(ChoiceEnumeration):
    ATTR1 = ChoiceEnumeration.Option('db_value1', 'Human readable text 1')
    ATTR2 = ChoiceEnumeration.Option('db_value2', 'Human readable text 2')

在choiceEnumeration子类上生成以下属性：

• ALL_OPTIONS-提供的选项的元组
• CHOICES-django char字段选择兼容元组
• CHOICES_DICT-选项字典：文本值
• DEFAULT-（可选）标记为默认值的项

典型的django示例如下：

class SomeModel(models.Model):
    class MetaVar(ChoiceEnumeration):
        FOO  = ChoiceEnumeration.Option('foo',  'Foo Choice', default=True)
        BAR  = ChoiceEnumeration.Option('bar',  'Bar Option')
        BAZ  = ChoiceEnumeration.Option('baz',  'Baz Pick')
        SPAM = ChoiceEnumeration.Option('spam', 'Spam spam spam')
        EGGS = ChoiceEnumeration.Option('eggs', 'Eggs, Spam, and Ham')

交互式用法示例：

>>> class MetaVar(ChoiceEnumeration):
...     FOO  = ChoiceEnumeration.Option('foo',  'Foo Choice', default=True)
...     BAR  = ChoiceEnumeration.Option('bar',  'Bar Option')
...     BAZ  = ChoiceEnumeration.Option('baz',  'Baz Pick')
...     SPAM = ChoiceEnumeration.Option('spam', 'Spam spam spam')
...     EGGS = ChoiceEnumeration.Option('eggs', 'Eggs, Spam, and Ham')
>>> MetaVar.FOO
u'foo'
>>> MetaVar.ALL_OPTIONS
(u'foo', u'bar', u'baz', u'spam', u'eggs')
>>> MetaVar.CHOICES
((u'foo', 'Foo Choice'), (u'bar', 'Bar Option'), (u'baz', 'Baz Pick'), (u'spam', 'Spam spam spam'), (u'eggs', 'Eggs, Spam, and Ham'))
>>> MetaVar.CHOICES_DICT
{u'baz': 'Baz Pick', u'eggs': 'Eggs, Spam, and Ham', u'foo': 'Foo Choice', u'bar': 'Bar Option', u'spam': 'Spam spam spam'}
>>> MetaVar.DEFAULT
u'foo'
>>> MetaVar.CHOICES_DICT[MetaVar.FOO]
'Foo Choice'

使枚举类

make_enum_class动态生成ChoiceEnumeration派生类。

示例：

from choice_enum import make_enum_class, Option
MetaVar = make_enum_class('MetaVar',
    FOO=Option('foo',  'Foo Choice', default=True),
    BAR=Option('bar',  'Bar Option'),
    BAZ=Option('baz',  'Baz Pick')
)