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In Python, enumerations (enums) provide a way to create named constant values, making your code more readable and maintainable. By default, when creating an enum, the values start from 1. However, you may encounter situations where you want the enumeration to start from 0. This tutorial will guide you through creating a Python enum that automatically starts from 0, along with code examples.
Before diving into the auto-start-from-0 feature, let's review the basics of creating an enum in Python.
In this example, Color is an enum with three members: RED, GREEN, and BLUE. By default, the enumeration starts from 1. To make it start from 0, we need to use the auto() functionality introduced in Python 3.10.
Python 3.10 introduced the auto() feature, which automatically assigns values starting from 0 and increments by 1 for each subsequent member.
Now, with the use of auto(), the Color enum will automatically assign values as follows: RED will have the value 0, GREEN will have the value 1, and BLUE will have the value 2.
Let's demonstrate the use of the auto-start-from-0 enum in a simple program:
In this example, we create an enum Color using auto() for each member. We then demonstrate how to access enum members, iterate over them, and retrieve their values.
By using the auto() functionality, the enum starts from 0, making the code more concise and less error-prone, especially when the enum values are sequential.
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