### Just Modern Python { #just-modern-python }

It's all based on standard **Python type** declarations (thanks to Pydantic). No new syntax to learn. Just standard modern Python.

If you need a 2 minute refresher of how to use Python types (even if you don't use FastAPI), check the short tutorial: [Python Types](python-types.md).

You write standard Python with types:

```Python
from datetime import date

By declaring types for your variables, editors and tools can give you better support.

This is just a **quick tutorial / refresher** about Python type hints. It covers only the minimum necessary to use them with **FastAPI**... which is actually very little.

**FastAPI** is all based on these type hints, they give it many advantages and benefits.

    assertThat(reader.nextPart()).isNull()
  }

  /**
   * Read 100 MiB of 'a' chars. This was really slow due to a performance bug in [MultipartReader],
   * and will be really slow if we regress the fix for that.
   */
  @Test
  fun `reading a large part with small byteCount`() {
    val multipartBody =
      MultipartBody
        .Builder("foo")
        .addPart(

            System.setProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS, "initial");
            assertEquals("initial", SystemUtil.getSearchEngineHttpAddress());

            // Change value and verify it's read fresh
            System.setProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS, "changed");
            assertEquals("changed", SystemUtil.getSearchEngineHttpAddress());

            // Clear property

          .headers(conditionalRequestHeaders.build())
          .build()
      return CacheStrategy(conditionalRequest, cacheResponse)
    }

    /**
     * Returns the number of milliseconds that the response was fresh for, starting from the served
     * date.
     */
    private fun computeFreshnessLifetime(): Long {
      val responseCaching = cacheResponse!!.cacheControl
      if (responseCaching.maxAgeSeconds != -1) {

     * <code>SmbFile</code> references a workgroup, the name of the workgroup
     * is returned. If this <code>SmbFile</code> refers to the root of this
     * SMB network hierarchy, <code>null</code> is returned.
     *
     * @return The server or workgroup name or <code>null</code> if this
     *         <code>SmbFile</code> refers to the root <code>smb://</code> resource.
     */
    public String getServer() {

    List<Object> equalArgs = new ArrayList<>(args);
    for (int i = 0; i < args.size(); i++) {
      Parameter param = params.get(i);
      Object arg = args.get(i);
      // Use new fresh value generator because 'args' were populated with new fresh generator each.
      // Two newFreshValueGenerator() instances should normally generate equal value sequence.
      Object shouldBeEqualArg = generateDummyArg(param, newFreshValueGenerator());

Pero si sabes que no necesitarás usar la dependencia después de regresar de la *path operation function*, puedes usar `Depends(scope="function")` para decirle a FastAPI que debe cerrar la dependencia después de que la *path operation function* regrese, pero **antes** de que se envíe el **response**.

{* ../../docs_src/dependencies/tutorial008e_an_py310.py hl[12,16] *}

`Depends()` recibe un parámetro `scope` que puede ser:

                if (lastUpdated != null && now != null && now.compareTo(lastUpdated) < 0) {
                    getLogger()
                            .warn("The last updated timestamp in " + metadataFile + " refers to the future (now = "
                                    + now
                                    + ", lastUpdated = " + lastUpdated + "). Please verify that the clocks of all"

     *            The name of the argument that must not be {@code null}.
     * @param argValue
     *            The value of the index.
     * @param arraySize
     *            The length of the array the index refers to.
     * @throws ClIllegalArgumentException
     *             If the argument is invalid as an array index.
     */