# Классы как зависимости { #classes-as-dependencies }

Прежде чем углубиться в систему **Внедрения Зависимостей**, давайте обновим предыдущий пример.

## `dict` из предыдущего примера { #a-dict-from-the-previous-example }

В предыдущем примере мы возвращали `dict` из нашей зависимости:

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

Но затем мы получаем `dict` в параметре `commons` *функции-обработчика пути*.

		Select(`
			NULL AS bool_field,
			NULL AS int_field,
			NULL AS int8_field,
			NULL AS int16_field,
			NULL AS int32_field,
			NULL AS int64_field,
			NULL AS uint_field,
			NULL AS uint8_field,
			NULL AS uint16_field,
			NULL AS uint32_field,
			NULL AS uint64_field,
			NULL AS float32_field,
			NULL AS float64_field,
			NULL AS string_field,
			NULL AS time_field,

* Todas elas incluirão as `responses` predefinidas.
* Todas essas *operações de rota* terão a lista de `dependencies` avaliada/executada antes delas.
    * Se você também declarar dependências em uma *operação de rota* específica, **elas também serão executadas**.

          do not modify the License. You may add Your own attribution
          notices within Derivative Works that You distribute, alongside
          or as an addendum to the NOTICE text from the Work, provided
          that such additional attribution notices cannot be construed
          as modifying the License.

      You may add Your own copyright statement to Your modifications and

          do not modify the License. You may add Your own attribution
          notices within Derivative Works that You distribute, alongside
          or as an addendum to the NOTICE text from the Work, provided
          that such additional attribution notices cannot be construed
          as modifying the License.

      You may add Your own copyright statement to Your modifications and

incoming object uploads and metadata changes to source object version. If active-active replication is configured, any incoming uploads and metadata changes to versions created on the target, will sync back to the source and be marked as `REPLICA` on the source. AWS, as well as MinIO do not by default sync metadata changes on a object version marked `REPLICA` back to source. This requires a setting in the replication configuration called [replica modification sync](https://aws.amazon.com/about-aws/what...

**Requests** is a library to *interact* with APIs (as a client), while **FastAPI** is a library to *build* APIs (as a server).

They are, more or less, at opposite ends, complementing each other.

Requests has a very simple and intuitive design, it's very easy to use, with sensible defaults. But at the same time, it's very powerful and customizable.

That's why, as said in the official website:

      <replaceConfiguration name="Treat some Guava Collection factory methods as Deprecated" uuid="82f9f9ab-9c3b-367f-99ad-40841dc13819" description="Many no-argument Guava Collection factory methods are marked in their javadoc &quot;Should be treated as deprecated&quot;.  These should not be used." suppressId="guava-collection-factory" problemDescriptor="Treat some Guava Collection factory methods as Deprecated" text="com.google.common.collect.Lists.newArrayList()" recursive="false" ca...

E as dependências pode ser criadas de uma forma bastante simples e intuitiva que permite que você importe apenas os pacotes Python que forem necessários, e integrá-los com as funções de sua API em algumas linhas de código, *literalmente*.

	strippedPathExpr   []*JSONPathElement
}

// AliasedExpression is an expression that can be optionally named
type AliasedExpression struct {
	Expression *Expression `parser:"@@"`
	As         string      `parser:"[ \"AS\" @Ident | \"AS\" @LitString ]"`
}

// Grammar for Expression
//
// Expression          → AndCondition ("OR" AndCondition)*
// AndCondition        → Condition ("AND" Condition)*