How Can C# Developers Represent Enums in Python?

Representing Enums in Python

Question:

As a C# developer working on a Python project, how can you represent the equivalent of an Enum in Python?

Answer:

Enumerations (Enums) have been introduced in Python 3.4 as part of PEP 435. They have also been backported to previous versions via third-party libraries like enum34 and aenum.

Using the enum Module (Python 3.4 ):

from enum import Enum

Animal = Enum('Animal', 'ant bee cat dog')

This creates an Animal Enum with members ant, bee, cat, and dog.

Using enum34 Library (Python 2.7 ):

from enum34 import Enum

Animal = Enum('Animal', 'ant bee cat dog')

Using aenum Library (Python 2.7 , 3.3 ):

from aenum import Enum

class Animal(Enum):
    ant = 1
    bee = 2
    cat = 3
    dog = 4

Earlier Technique for Python Pre-3.4:

In earlier versions of Python, you can use a custom enum() function to create your own enums:

def enum(**enums):
    return type('Enum', (), enums)

Numbers = enum(ONE=1, TWO=2, THREE='three')

Additional Techniques:

• Automatic enumeration: Use functions like enum(*sequential, **named) to automatically generate members based on provided names.
• Reverse mapping: Add a reverse_mapping attribute to your Enum to easily convert values back to names.
• MyPy typing.Literal: Use typing.Literal to define type-safe enums in Python 3.8 .

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