Attrs

attrs is a well known library to define classes in a nicer & shorter way. generics library works out of the box with attrs. As with all previous examples we advice you to make your instances immutable. attrs library has a first class support for immutability. Enable frozen setting on class and use evolve function to copy instancies of it.

>>> from attr import attrs, attrib, evolve
>>> from generics import private

>>> @private
... @attrs(frozen=True)
... class User:
...     name = attrib()
...     def greet(self):
...         return f"Hello, {self.name}"
...     def rename(self, name):
...         return evolve(self, name=name)
...

>>> User
Private::User

>>> user = User("Jeff")
>>> user
Private::User(name='Jeff')

>>> user.greet()
'Hello, Jeff'

>>> user.rename("Kate")
Private::User(name='Kate')

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