annotations — Intermediate Playground

Dictionary of type annotations for a function or class

Python Playground

# Using __annotations__ with custom classes
class Registry:
    def __init__(self):
        self._items = {}

    def register(self, cls):
        self._items[cls.__name__] = cls
        return cls

    def get(self, name):
        return self._items.get(name)

registry = Registry()

@registry.register
class Widget:
    pass

@registry.register
class Button:
    pass

print(registry._items)
print(registry.get("Widget"))

Output

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Custom classes interact with __annotations__ in specific ways that are useful to understand.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Intermediate examples for __annotations__

__annotations__ — Intermediate Playground

Challenge

annotations — Intermediate Playground