Cara menggunakan python enum with attributes

An alternative to the built-in Python from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 6 implementation. Tested in Python 3.6 and above.

Data enums allow you to:

• Associate data with enum members without using tuple-based initialization
• Use an intuitive initialization syntax to define members
• Define pure enums without using from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 7
• Define value-based enums without storing them as class attributes
• Define secondary unique keys & use them to look up enum members
• Use classmethod syntax (from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 8) to look up members, instead of using initializers

Usage

Install via PyPI:

pip install data-enum

Minimal usage:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro')

Access the members by value:

Currency.get('USD') Currency.get('CAD') Currency.get('EUR')

Store the members as attributes:

class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency.CAD = Currency('CAD', symbol='$', name='Canadian dollar') Currency.USD = Currency('USD', symbol='$', name='United States dollar') Currency.EUR = Currency('EUR', symbol='€', name='Euro')

Use a custom attribute as the primary ID:

class Currency(DataEnum): primary_attribute = 'code' data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro')

Use integers as primary IDs:

class Door(DataEnum): data_attributes = ('description',) Door(1, description='Door #1') Door(2, description='Door #2') Door(3, description='Door #3') d2 = Door(2) # returns Door(2, description='Door #2') int(d2) # returns 2

Or, skip primary IDs altogether for a pure enumeration:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency.CAD = Currency(symbol='$', name='Canadian dollar') Currency.USD = Currency(symbol='$', name='United States dollar') Currency.EUR = Currency(symbol='€', name='Euro')

Access the attached data:

print(Currency.USD.name) # prints 'United States dollar' print(Currency.EUR.symbol) # prints '€' print(Currency.USD) # prints 'USD'

Compare directly:

Currency.USD == Currency.CAD # returns False Currency.EUR == Currency.EUR # returns True

Enforce unique secondary attributes:

class Currency(DataEnum): # Use a tuple with the second value as True for unique keys data_attributes = (('symbol', True), 'name') # Throws ValueError Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar')

Look up members by unique secondary attributes:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 0

Look up with members with defaults:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 1

Testing, etc.

Install requrements:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 2

Sort imports (Requires Python >= 3.6):

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 3

Lint (Requires Python >= 3.6):

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 4

Test:

from data_enum import DataEnum class Currency(DataEnum): data_attributes = ('symbol', 'name') Currency('CAD', symbol='$', name='Canadian dollar') Currency('USD', symbol='$', name='United States dollar') Currency('EUR', symbol='€', name='Euro') 5