INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary>About the command <code>fastapi dev main.py</code>...</summary>

The command `fastapi dev` reads your `main.py` file, detects the **FastAPI** app in it, and starts a server using <a href="https://www.uvicorn.org" class="external-link" target="_blank">Uvicorn</a>.

By default, `fastapi dev` will start with auto-reload enabled for local development.

///

### <a href="https://sanic.readthedocs.io/en/latest/" class="external-link" target="_blank">Sanic</a>

Sanic, `asyncio`'ya dayanan son derece hızlı Python kütüphanelerinden biriydi. Flask'a epey benzeyecek şekilde geliştirilmişti.

/// note | Teknik detaylar

    managed both idle and active connections for HTTP/2, but only idle
    connections for HTTP/1.x. With this update the connection pool manages both
    idle and active connections for everything. OkHttp now detects and warns on
    connections that were allocated but never released, and will enforce HTTP/2
    stream limits. This update also fixes `Call.cancel()` to not do I/O on the
    calling thread.

        return;
      }
      // First, check whether var -> arg forms a cycle
      for (Type t = arg; t != null; t = mappings.get(TypeVariableKey.forLookup(t))) {
        if (var.equalsType(t)) {
          // cycle detected, remove the entire cycle from the mapping so that
          // each type variable resolves deterministically to itself.
          // Otherwise, an F -> T cycle will end up resolving both F and T

```Python hl_lines="1  4"
{!../../docs_src/python_types/tutorial009.py!}
```

O uso de `Optional[str]` em vez de apenas `str` permitirá que o editor o ajude a detectar erros, onde você pode estar assumindo que um valor é sempre um `str`, quando na verdade também pode ser `None`.

`Optional[Something]` é na verdade um atalho para `Union[Something, None]`, eles são equivalentes.

Her neyse, yukarıdaki durumlardan herhangi birinde, FastAPI yine de asenkron olarak çalışacak ve son derece hızlı olacaktır.

Ancak yukarıdaki adımları takip ederek, bazı performans optimizasyonları yapılabilecektir.

## Teknik Detaylar

     IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION,
     WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR
     PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS,
     ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT
     KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT
     ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.

	}
	_, ok := ps[policy1]
	if !ok {
		c.Fatalf("policy was missing!")
	}

	// Detach policy1 to set up for policy2
	_, err = s.adm.DetachPolicy(ctx, madmin.PolicyAssociationReq{
		Policies: []string{policy1},
		User:     accessKey,
	})
	if err != nil {
		c.Fatalf("unable to detach policy: %v", err)
	}

	// 3.2 associate policy to user

			HandlerFunc(adminMiddleware(adminAPI.SetPolicyForUserOrGroup)).
			Queries("policyName", "{policyName:.*}", "userOrGroup", "{userOrGroup:.*}", "isGroup", "{isGroup:true|false}")

		// Attach/Detach policies to/from user or group
		adminRouter.Methods(http.MethodPost).Path(adminVersion + "/idp/builtin/policy/{operation}").HandlerFunc(adminMiddleware(adminAPI.AttachDetachPolicyBuiltin))

		// Remove user IAM

* Un script de bash que ejecuta los pasos previos y luego inicia tu aplicación
    * Aún necesitarías una forma de iniciar/reiniciar *ese* script de bash, detectar errores, etc.

/// tip | Consejo

Te daré más ejemplos concretos para hacer esto con contenedores en un capítulo futuro: [FastAPI en Contenedores - Docker](docker.md){.internal-link target=_blank}.

///