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Today's topic is enum module. PEP 435 introduced the enum module in Python 3.4, providing support for enumerations in Python.
Enumerations are sets of symbolic names (members) bound to unique, constant values. They are used to make code more descriptive and readable. Enums help to address specific variant or case in your code, without actually relying on the value corresponding to that variant.
Quiz
Which one of these code samples correctly demonstrates the use of Enums in Python?
Sample 1
from enum import Enum
class Color(Enum):
RED = 1
GREEN = 2
BLUE = 3
favorite_color = Color.RED
print(favorite_color.name, favorite_color.value)
Sample 2
class Color:
RED = 1
GREEN = 2
BLUE = 3
favorite_color = Color.RED
print(favorite_color.name, favorite_color.value)
Post your answer in the comments – is it 0 for the first sample or 1 for the second! As usual, the correct answer will be explained in the comment.
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Top comments (1)
Enums in Python explained
The correct answer is Sample 1.
In Sample 1, we correctly use the
enummodule to define an enumeration classColor. By inheriting fromEnum, each member of theColorclass is turned into an enumeration instance, each with aname(like'RED') and avalue(like1). This is the recommended way to create enumerable constants in Python as per PEP 435.Sample 2, while it does define a class with constant attributes, does not benefit from the advantages of an
enum. The members of theColorclass in Sample 2 are just class attributes. They do not have thenameandvalueattributes that a trueenummember has, and attempting to access them as shown in the print statement would result in an AttributeError. This approach lacks the readability, safety, and features provided by theenummodule.