Skip to content

Tag: enums

Is there a way to specify a default value for python enums?

Given the following enum: How can I specify a default value. I want to be able to do: and havemy_val be <MyEnum.A: 0> Is this possible? I’ve tried customizing __new__, __init__, __call__ but I can’t get it to work. Answer MyEnum(..) is handled by EnumMeta.__call__. You need to override that …

Representation of all values in Flag enum

I would like to have a “ALL” flag in my python Flags enum for which holds true. I currently have: Because this enum might grow at any state of development I would like to have something like This does not work: Please note that this question currently only relates to python 3.6 or later. Answer Th…

How to define enum values that are functions?

I have a situation where I need to enforce and give the user the option of one of a number of select functions, to be passed in as an argument to another function: I really want to achieve something like the following: So the following can be executed: Answer Your assumption is wrong. Values can be arbitrary,…

Python Enum, when and where to use?

Python 3.4.0 introduced enum, I’ve read the doc but still don’t know the usage of it. From my perspective, enum.Enum is an extended namedtuple type, which may not be true. So these are what I want to know about Enum: When and where to use Enum? Why do we need Enum? What are the advantages? What ex…