In which scenarios is it most appropriate to use a metaclass instead of a class?

When you need to customize the behavior of a specific instance.
When you want to create a simple object.
When you want to customize the behavior of a group of classes.
When you want to define a new data type.

Metaclasses are most appropriate when you need to customize the behavior of a group of classes, such as enforcing coding standards, implementing singletons, or automating repetitive tasks for classes. They are not typically used for customizing individual instance behavior.

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