* http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

    )
    field_alias = (
        (field.validation_alias or field.alias)
        if field.mode == "validation"
        else (field.serialization_alias or field.alias)
    )

    # This expects that GenerateJsonSchema was already used to generate the definitions
    json_schema = field_mapping[(field, override_mode or field.mode)]
    if "$ref" not in json_schema:
        # TODO remove when deprecating Pydantic v1

**FastAPI** se basa completamente en estas anotaciones de tipos, dándole muchas ventajas y beneficios.

Pero incluso si nunca usas **FastAPI**, te beneficiaría aprender un poco sobre ellas.

/// note | Nota

Si eres un experto en Python, y ya sabes todo sobre las anotaciones de tipos, salta al siguiente capítulo.

///

## Motivación { #motivation }

Comencemos con un ejemplo simple:

{* ../../docs_src/python_types/tutorial001_py39.py *}

            than specifying a value for finalName directly in the plugin configuration section. It is also useful to
            ensure that - for example - a List-typed parameter which expects items of type Artifact doesn't get a List
            full of Strings.
          </description>
        </field>
        <field>
          <name>description</name>
          <version>1.0.0+</version>

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

But even if you never use **FastAPI**, you would benefit from learning a bit about them.

/// note

If you are a Python expert, and you already know everything about type hints, skip to the next chapter.

///

## Motivation { #motivation }

Let's start with a simple example:

{* ../../docs_src/python_types/tutorial001_py39.py *}

 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

                }
            }
        } catch (final IOException e) {
            logger.warn("Failed to read a click log.", e);
        }
    }

    /**
     * Exports all crawling information parameters to CSV format.
     * The CSV output includes: SessionId, SessionCreatedTime, Key, Value, CreatedTime.
     * Uses cursor-based selection to handle large datasets efficiently.
     *

        byte[] encodeBuffer = new byte[1024];
        NdrBuffer dst = new NdrBuffer(encodeBuffer, 0);
        enumEx.encode_in(dst);

        // Simulate decode_out
        // The decode_out method expects the info and totalentries to be already initialized
        // and will decode into them.
        netdfs.DfsEnumStruct decodedInfo = new netdfs.DfsEnumStruct();
        NdrLong decodedTotalEntries = new NdrLong(0);

  static final Object NULL = new Object();

  /*
   * Despite declaring this field in AbstractFutureState, we still use the logger for
   * AbstractFuture: Users may have tests or log configuration that expects that to be the logger
   * used for exceptions from listeners, as it's been in the past.
   */
  static final LazyLogger log = new LazyLogger(AbstractFuture.class);

  static final boolean GENERATE_CANCELLATION_CAUSES;

  private static int ceilToPowerOfTwo(int x) {
    return 1 << IntMath.log2(x, RoundingMode.CEILING);
  }

  /*
   * This method was written by Doug Lea with assistance from members of JCP JSR-166 Expert Group
   * and released to the public domain, as explained at
   * http://creativecommons.org/licenses/publicdomain
   *
   * As of 2010/06/11, this method is identical to the (package private) hash method in OpenJDK 7's