L'utiliser dans votre éditeur est ce qui vous montre vraiment les avantages de FastAPI, en voyant le peu de code que vous avez à écrire, toutes les vérifications de type, l'autocomplétion, etc.

---

## Installer FastAPI

La première étape consiste à installer FastAPI.

Pour le tutoriel, vous voudrez peut-être l'installer avec toutes les dépendances et fonctionnalités optionnelles :

<div class="termy">

```console
$ pip install fastapi[all]

    cat "$FROM_ENV"
    source "$FROM_ENV"
    rm "$FROM_ENV"
  fi
  set +u
fi

# If building installer wheels, set the required environment variables that are
# read by setup.py.
if [[ "$TFCI_INSTALLER_WHL_ENABLE" == 1 ]]; then
  export collaborator_build=True
  # If building nightly installer wheels, set the project name to
  # nightly equivalent.
  if [[ "$TFCI_NIGHTLY_UPDATE_VERSION_ENABLE" == 1 ]]; then

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.artifact.installer;

import java.io.File;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.repository.ArtifactRepository;

/**
 */
@Deprecated
public interface ArtifactInstaller {

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.artifact.installer;

/**
 */
@Deprecated
public class ArtifactInstallationException extends Exception {
    public ArtifactInstallationException(String message) {
        super(message);
    }

        «««
        # Install Packages { #install-packages }
        »»»

    Translate with (German):

        «««
        # Pakete installieren { #install-packages }
        »»»

    Do NOT translate with (German):

        «««
        # Installieren Sie Pakete { #install-packages }
        »»»

    Source (English):

        «««
        ### Run Your Program { #run-your-program }

//// tab | Linux, macOS

Let's say you install Python and it ends up in a directory `/opt/custompython/bin`.

If you say yes to update the `PATH` environment variable, then the installer will add `/opt/custompython/bin` to the `PATH` environment variable.

It could look like this:

```plaintext
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/custompython/bin
```

import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.deployer.ArtifactDeploymentException;
import org.apache.maven.artifact.installer.ArtifactInstallationException;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.RepositoryRequest;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;

### Ohne `fastapi-cloud-cli` { #without-fastapi-cloud-cli }

Wenn Sie FastAPI mit den Standardabhängigkeiten, aber ohne das `fastapi-cloud-cli` installieren möchten, können Sie mit `pip install "fastapi[standard-no-fastapi-cloud-cli]"` installieren.

### Zusätzliche optionale Abhängigkeiten { #additional-optional-dependencies }

## `websockets` installieren { #install-websockets }

Stellen Sie sicher, dass Sie eine [virtuelle Umgebung](../virtual-environments.md){.internal-link target=_blank} erstellen, sie aktivieren und `websockets` installieren (eine Python-Bibliothek, die die Verwendung des „WebSocket“-Protokolls erleichtert):

<div class="termy">

```console

.installed.cfg
*.egg
MANIFEST

# PyInstaller
#  Usually these files are written by a python script from a template
#  before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec

# Installer logs
pip-log.txt
pip-delete-this-directory.txt

# Unit test / coverage reports
htmlcov/
.tox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
.hypothesis/
.pytest_cache/