In JavaScript we can do this:
var Color = {
YELLOW: { value: 1, displayString: "Yellow" },
GREEN: { value: 2, displayString: "Green" },
}
So I can call:
Color.YELLOW.displayString
In Java we can do this:
public enum Color {
YELLOW (1, "Yellow"),
GREEN (2, "Green"),
private Color(String value, int displayString){
this.value = value;
this.displayString = displayString;
}
private final int value;
private final String displayString;
public String getValue() {return value;}
public String getDisplayString() {return displayString;}
}
So I can call:
Color.YELLOW.getDisplayString()
After much research I haven't found a clean way to do this in Python using the built-in Enum module. How can I do this?
Thanks
Enums can't have multiple value per name.
The preferred syntax for defining enums in JavaScript is to use the objects see the code below:- var DaysEnum = Object. freeze({"monday":1, "tuesday":2, "wednesday":3, ...})
auto() method, we can get the assigned integer value automatically by just using enum. auto() method. Syntax : enum.auto() Automatically assign the integer value to the values of enum class attributes.
There are two concepts involved here: enumerations and attribute-style access to object members that can be initialised inline. For the latter, you'll need some kind of custom class, but since you want something very straightforward, a namedtuple
is sufficient for that. So, combining namedtuple
and enum
, this could be a solution:
from enum import Enum
from collections import namedtuple
Color = namedtuple('Color', ['value', 'displayString'])
class Colors(Enum):
@property
def displayString(self):
return self.value.displayString
yellow = Color(1, 'Yellow')
green = Color(2, 'Green')
print(Colors.yellow.displayString)
Here is another approach, that is the code from: https://github.com/hzdg/django-enumfields
import enum
import inspect
class ColorEnumMeta(enum.EnumMeta):
def __new__(mcs, name, bases, attrs):
DisplayStrings = attrs.get('DisplayStrings')
if DisplayStrings is not None and inspect.isclass(DisplayStrings):
del attrs['DisplayStrings']
if hasattr(attrs, '_member_names'):
attrs._member_names.remove('DisplayStrings')
obj = super().__new__(mcs, name, bases, attrs)
for m in obj:
m.display_string = getattr(DisplayStrings, m.name, None)
return obj
class Color(enum.Enum, metaclass=ColorEnumMeta):
yellow = 1
green = 2
class DisplayStrings:
yellow = 'Yellow'
green = 'Green'
print(Color.yellow.display_string) # 'Yellow'
or something that is based on this code, but a bit shorter:
import enum
class ColorEnumMeta(enum.EnumMeta):
def __new__(mcs, name, bases, attrs):
obj = super().__new__(mcs, name, bases, attrs)
obj._value2member_map_ = {}
for m in obj:
value, display_string = m.value
m._value_ = value
m.display_string = display_string
obj._value2member_map_[value] = m
return obj
class Color(enum.Enum, metaclass=ColorEnumMeta):
yellow = 1, 'Yellow'
green = 2, 'Green'
print(Color.yellow.display_string) # 'Yellow'
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