iterating list with enum of string

Question

I have a

myenum(str, Enum):
   COLORRED = 'colorred'
   COLORBLUE = 'colorblue'

itemList = [<myenum.COLORRED,'colorred'>]

I am trying to get value from itemList 'coloured' but itemList.value gives a type check error in Python with the error message "str has no attribute value".

list(map(str,myenum)) gives key COLORRED but I need the value 'coloured'. I tried String-based enum in Python but none of them are working for me.

My enum is auto generated by openapi. below is yaml for it. I receive array of myElements and need one value in myEnum.

myElements:
  type: array
  items:
  allOf:
     - $ref: 'myEnum'

myEnum:
  type: String
  enum:
    - 'state1'
    - 'state2'

Note: Issue is with typecheck in python not iterating the values. I need enum values without using .values or .name

Please update your question with a complete snippet of code that we can run to see the problem ourselves. — Ethan Furman
– Ethan Furman, Commented Jun 15, 2023 at 18:41

Adam Smith · Accepted Answer · 2023-06-15 05:05:43Z

4

Looks like you're trying to use the list's .value property, not its elements.

from enum import Enum

class Color(Enum):
    RED = "color red"
    BLUE = "color blue"

lst = [Color.RED, Color.BLUE]
expected = ['color red', 'color blue']

# This is equivalent to `list(map(lambda v: v.value, lst))`
values = [item.value for item in lst]
assert values == expected

answered Jun 15, 2023 at 5:05

Adam Smith

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4 Comments

shekhar pandey Over a year ago

I tried this way but still get type check error "str has no attribute value". can we iterate without .value and get the value instead of key?

Adam Smith Over a year ago

@shekharpandey I cannot reproduce that. From the error message, it sounds like the elements of your list are strings, not your enum members. Make sure your data is what you expect it to be.

shekhar pandey Over a year ago

You are correct, but my list is like this itemList = [<myenum.COLORRED, 'colorred'>] and I just want 'coloured'. Also its work fine but typecheck is giving error.

Adam Smith Over a year ago

@shekharpandey yeah sorry, I can't reproduce your behavior on Python3 or Python2. You should try to figure out what your object is, because based on the error message you're incorrect about that :)

iGian · Accepted Answer · 2023-06-15 08:17:55Z

1

Your point is not exactly clear to me, but...

If you are using Python 3.11 you can use StrEnum, so you can get the value without calling .value.

class Color(StrEnum):
    RED = 'red'
    GREEN = 'green'
    BLUE = 'blue'

print(Color.RED) #=> red

There is also IntEnum.

answered Jun 15, 2023 at 8:17

iGian

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Comments

dakdad · Accepted Answer · 2023-06-15 08:30:51Z

0

I believe what you are after is the values of the enum in a list. If so, this may be something you can work with.

from enum import Enum

class myenum(str, Enum):
    COLORRED = 'colorred'
    COLORBLUE = 'colorblue'

mylist = [x.value for x in myenum]
# where mylist will be ['colorred', 'colorblue']

However, if you explain how you generate your list and how you would like to use the data (perhaps with a simple example), that might help the people to understand your objectives better.

answered Jun 15, 2023 at 8:30

dakdad

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1 Comment

shekhar pandey Over a year ago

@ dakdad Sorry for clarity, I have updated post. mylist = [x.value for x in myenum] is working but type check tool give error "str has no attribute value"

jojo · Accepted Answer · 2025-03-28 18:30:44Z

0

Use magic method :

from enum import StrEnum, auto


class Color(StrEnum):
    RED = auto()
    GREEN = auto()
    BLUE = auto()

    @classmethod
    def __iter__(cls):
        return iter(cls.__members__.values())

edited Mar 28 at 18:30

answered Mar 28 at 18:28

jojo

11 bronze badge

1 Comment

Community Mar 29 at 0:38

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

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