URLClassLoader classloader = new URLClassLoader(new URL[] {url}, null);
    assertThat(ClassPath.from(classloader).getTopLevelClasses()).isNotEmpty();
  }

  @AndroidIncompatible // ClassPath is documented as not supporting Android

  public void testScan_classPathCycle() throws IOException {
    File jarFile = File.createTempFile("with_circular_class_path", ".jar");
    try {
      writeSelfReferencingJarFile(jarFile, "test.txt");

    URLClassLoader classloader = new URLClassLoader(new URL[] {url}, null);
    assertThat(ClassPath.from(classloader).getTopLevelClasses()).isNotEmpty();
  }

  @AndroidIncompatible // ClassPath is documented as not supporting Android

  public void testScan_classPathCycle() throws IOException {
    File jarFile = File.createTempFile("with_circular_class_path", ".jar");
    try {
      writeSelfReferencingJarFile(jarFile, "test.txt");

      return build(/* throwIfDuplicateKeys= */ true);
    }

    public ImmutableMap<K, V> buildKeepingLast() {
      if (valueComparator != null) {
        // Probably not worth supporting this in GWT
        throw new UnsupportedOperationException(
            "orderEntriesByValue + buildKeepingLast not supported under GWT");
      }
      return build(/* throwIfDuplicateKeys= */ false);
    }

      assertFalse(MoreFiles.isRegularFile(NOFOLLOW_LINKS).apply(symlinkToFile));
    }
  }

  /**
   * Creates a new file system for testing that supports the given features in addition to
   * supporting symbolic links. The file system is created initially having the following file
   * structure:
   *
   * <pre>
   *   /
   *      work/
   *         dir/
   *            a
   *            b/

      assertFalse(MoreFiles.isRegularFile(NOFOLLOW_LINKS).apply(symlinkToFile));
    }
  }

  /**
   * Creates a new file system for testing that supports the given features in addition to
   * supporting symbolic links. The file system is created initially having the following file
   * structure:
   *
   * <pre>
   *   /
   *      work/
   *         dir/
   *            a
   *            b/

# Release 2.1.0

TensorFlow 2.1 will be the last TF release supporting Python 2. Python 2 support
[officially ends an January 1, 2020](https://www.python.org/dev/peps/pep-0373/#update).
[As announced earlier](https://groups.google.com/a/tensorflow.org/d/msg/announce/gVwS5RC8mds/dCt1ka2XAAAJ),
TensorFlow will also stop supporting Python 2 starting January 1, 2020, and no
more releases are expected in 2019.

  
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And with this, support for **Pydantic v1 is now deprecated** and will be **removed** from FastAPI in a future version soon.

**Note**: have in mind that the Pydantic team already stopped supporting Pydantic v1 for recent versions of Python, starting with Python 3.14.

  
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Mais si vous suivez bien les instructions ci-dessus, il pourra effectuer quelques optimisations et ainsi améliorer les performances.

## Détails techniques { #technical-details }

Les versions modernes de Python supportent le **code asynchrone** grâce aux **« coroutines »** avec les syntaxes **`async` et `await`**.

Analysons les différentes parties de cette phrase dans les sections suivantes :

* **Code asynchrone**
* **`async` et `await`**