Adding non-integer member values to IntEnum in Python3

Question

I have roughly the following:

class Foo(IntEnum):
  a = 0
  b = auto()
  c = auto()
  strings = ["Alpha", "Beta", "Charlie"]
  def __str__(self):
    return Foo.strings[self]

However, this raises:

TypeError: int() argument must be a string, a bytes-like object or a number, not 'EnumMeta'

I need to have additional data inside my Foo class, but it appears that Python doesn't like that.

Is there something I'm doing incorrectly, or is there a better way to do this? I'm used to Enum Classes in C++.

You are trying to do something along the lines of strings[Foo Object] while python is expecting strings[index as int, 0, 1 or 2] — Bijay Regmi
– Bijay Regmi, Commented May 14, 2022 at 23:51

user852541 · Accepted Answer · 2022-05-15 00:40:31Z

1

After a fair bit of digging, I found a way to get the proper behavior that I was looking for. Firstly, I had to use Enum instead of IntEnum. Secondly, I had to upgrade to Python3.11 and use the nonmember function to mark things that are not enumerable.

answered May 15, 2022 at 0:40

user852541

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1 Comment

Ethan Furman Over a year ago

3.11 is still in beta. :-) I'm glad the additions are working for you. And yes, the problem was because it was trying to turn your list of strings into an integer. Using nonmember should allow you to use IntEnum, though.

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