If we find that condition was set to "Unacceptable", we set shelf_id to None — but we don’t store condition itself in the class instance. When to use Python dataclasses—and when not to use them ...

The pattern-matching syntax introduced in Python 3.10 allows for ... control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.

Also read: How to use lists in Python This is not an array, however. That’s because an array is a data structure that uses an “index” or “key” to store each value.