Enumerated types or "enums" are a feature of many languages, including Python; enums provide a convenient way to collect up a bunch of related symbols that (typically) evaluate to integer values. The ...

The "enum" type in Python lets you create variables constrained to a predefined range of values. Learn how this built-in Python type can be used to express the state of something, whether as a string, ...

if x in Colour.names(): ... if x in Colour.values(): ... That provides both use cases, and because it's explicit it's always immediately obvious what is meant, even if you're not familiar with enums.