NamedTuple Classes

Overview

Using typing.NamedTuple is somewhat similar to using @dataclass(frozen = True). There are some significant differences in the implementation details, however. In particular, the typing.NamedTuple class does not support inheritance in the most obvious way. This leads us to a design based on composition of objects in the Sample class hierarchy. With inheritance, we’re often extending a base class to add features. With composition, we’re often building multi-part objects of several different classes.

Here’s the definition of Sample as NamedTuple. It looks similar to the @dataclass definition. The definition of KnownSample, however, must change dramatically: