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Providers
=========
Providers are strategies of accessing objects. They define how particular
objects are provided.
Providers help you to define how objects are created. They manage objects lifetime and their
dependencies.
Every provider is callable (implements ``__call__()``). Every call to provider
instance returns provided result, according to the providing strategy of
particular provider.
Each provider is a callable. You call the provider like a function when you need to create an
object or call a function. Provider calls all dependent providers to retrieve the dependencies
and injects them.
Current documentation section consists from description of standard providers
library and some useful information like overriding of providers and writing
of custom providers.
Any of the providers can be overridden by another provider. When provider is overridden it calls
to the overriding provider. This helps in testing or overriding API clients with stubs for dev or
stage environment.
Providers package API docs - :py:mod:`dependency_injector.providers`