59 lines
1.2 KiB
ReStructuredText
59 lines
1.2 KiB
ReStructuredText
.. _provider-typing:
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Typing and mypy
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===============
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.. meta::
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:keywords: Python,DI,Dependency injection,IoC,Inversion of Control,Providers,Typing,Mypy,
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Pattern,Example
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:description: Dependency Injector providers are mypy-friendly. Providers module goes with the
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typing stubs to provide the typing information to ``mypy``, IDEs and editors.
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Providers are ``mypy``-friendly.
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Providers module goes with the typing stubs. It provides typing information to ``mypy`` and your
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IDE.
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.. code-block:: python
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from dependency_injector import providers
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class Animal:
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...
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class Cat(Animal)
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...
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provider = providers.Factory(Cat)
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if __name__ == '__main__':
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animal = provider() # mypy knows that animal is of type "Cat"
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You can use ``Provider`` as a generic type. This helps when a provider is an argument of a
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function or method.
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.. code-block:: python
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:emphasize-lines: 12
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from dependency_injector import providers
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class Animal:
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...
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class Cat(Animal)
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...
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provider: providers.Provider[Animal] = providers.Factory(Cat)
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if __name__ == '__main__':
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animal = provider() # mypy knows that animal is of type "Animal"
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