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 ...

Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.

When to use Python classes. If you know how to use variables in Python, this works similarly: except instead of storing one piece of data as an integer, you are storing custom information about an ...