# Using Dataclasses

FastAPI is built on top of **Pydantic**, and I have been showing you how to use Pydantic models to declare requests and responses.

But FastAPI also supports using <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> the same way:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

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<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single user,
 |                 and is normally provided in ${user.home}/.m2/settings.xml.
 |

cloud storage service. Use MinIO to build high performance infrastructure for machine learning, analytics and application data workloads. | IMPORTANT | | ---------- | | This Helm chart is community built, maintained, and supported. MinIO does not guarantee support for any given bug, feature request, or update referencing this chart. <br/><br/> MinIO publishes a separate [MinIO Kubernetes Operator and Tenant Helm Chart](https://github.com/minio/operator/tree/master/helm) that is officially maintained and...

cloud storage service. Use MinIO to build high performance infrastructure for machine learning, analytics and application data workloads. | IMPORTANT | | ---------- | | This Helm chart is community built, maintained, and supported. MinIO does not guarantee support for any given bug, feature request, or update referencing this chart. <br/><br/> MinIO publishes a separate [MinIO Kubernetes Operator and Tenant Helm Chart](https://github.com/minio/operator/tree/master/helm) that is officially maintained and...

// are responsible for serializing and deserializing the objects that contain
// their internal state.
// Once a ControllerRevision has been successfully created, it can not be updated.
// The API Server will fail validation of all requests that attempt to mutate
// the Data field. ControllerRevisions may, however, be deleted. Note that, due to its use by both

}

// compareSignatureV2 returns true if and only if both signatures
// are equal. The signatures are expected to be base64 encoded strings
// according to the AWS S3 signature V2 spec.
func compareSignatureV2(sig1, sig2 string) bool {
	// Decode signature string to binary byte-sequence representation is required
	// as Base64 encoding of a value is not unique:
	// For example "aGVsbG8=" and "aGVsbG8=\r" will result in the same byte slice.

The GOOS and GOARCH environment variables set the desired target.

Flags:

	-D name[=value]
		Predefine symbol name with an optional simple value.
		Can be repeated to define multiple symbols.
	-I dir1 -I dir2
		Search for #include files in dir1, dir2, etc,
		after consulting $GOROOT/pkg/$GOOS_$GOARCH.
	-S
		Print assembly and machine code.
	-V

// See the License for the specific language governing permissions and
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// The auth package provides support for checking the authentication and authorization policy applied
// in the mesh. It aims to increase the debuggability and observability of auth policies.
// Note: this is still under active development and is not ready for real use.
package authz

import (
	"fmt"
	"io"

cloud storage service. Use MinIO to build high performance infrastructure for machine learning, analytics and application data workloads. | IMPORTANT | | ---------- | | This Helm chart is community built, maintained, and supported. MinIO does not guarantee support for any given bug, feature request, or update referencing this chart. <br/><br/> MinIO publishes a separate [MinIO Kubernetes Operator and Tenant Helm Chart](https://github.com/minio/operator/tree/master/helm) that is officially maintained and...

            return true;
        }
        return exists(); // try opening and catch sharing violation?
    }

/**
 * Tests to see if the file this <code>SmbFile</code> represents
 * exists and is not marked read-only. By default, resources are
 * considered to be read-only and therefore for <code>smb1://</code>,
 * <code>smb1://workgroup/</code>, and <code>smb1://server/</code> resources
 * will be read-only.
 *