Con **FastAPI** obtienes todas las funcionalidades de **Pydantic** (ya que FastAPI está basado en Pydantic para todo el manejo de datos):

* **Sin complicaciones**:
    * Sin micro-lenguaje de definición de esquemas nuevo que aprender.
    * Si conoces los tipos en Python sabes cómo usar Pydantic.

Estas funcionalidades son para lo que fue creado Marshmallow. Es un gran paquete, y lo he usado mucho antes.

Pero fue creado antes de que existieran las anotaciones de tipos en Python. Así que, para definir cada <abbr title="la definición de cómo deberían formarse los datos">esquema</abbr> necesitas usar utilidades y clases específicas proporcionadas por Marshmallow.

/// check | Inspiró a **FastAPI** a

# don't pass --nobuild, so they're on their own.
#
# Although buildifier checks for formatting as well, "bazel build nobuild"
# checks for cross-file issues like bad includes or missing BUILD definitions.
#
# We can't test on the windows toolchains because they're using a legacy
# toolchain format (or something) that specifies the toolchain directly instead

import jcifs.smb1.dcerpc.ndr.NdrException;
import jcifs.smb1.dcerpc.ndr.NdrObject;
import jcifs.smb1.dcerpc.ndr.NdrSmall;

/**
 * LSA RPC (Local Security Authority Remote Procedure Call) definitions.
 * Provides interface definitions and data structures for LSA RPC operations.
 */
public class lsarpc {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private lsarpc() {

      InternetDomainName domain = InternetDomainName.from(inputName);

      /*
       * We would ordinarily use constants for the expected results, but
       * doing it by derivation allows us to reuse the test case definitions
       * used in other tests.
       */

      String expectedName = Ascii.toLowerCase(inputName);
      expectedName = expectedName.replaceAll("[\u3002\uFF0E\uFF61]", ".");

THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM
CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.

   1. DEFINITIONS

   "Contribution" means:

a) in the case of the initial Contributor, the initial code and documentation
distributed under this Agreement, and

      b) in the case of each subsequent Contributor:

        globalParams.clear();
        tagQueue.clear();
    }

    /**
     * SAX event handler called when an XML start element is encountered.
     * Processes collection definitions and tracks the element hierarchy.
     *
     * @param uri the namespace URI, or empty string if none
     * @param localName the local name without prefix, or empty string if namespace processing is not performed

{* ../../docs_src/python_types/tutorial001.py hl[2] *}

### Edítalo

Es un programa muy simple.

Pero ahora imagina que lo escribieras desde cero.

En algún momento habrías empezado la definición de la función, tenías los parámetros listos...

Pero luego tienes que llamar "ese método que convierte la primera letra a mayúscula".

¿Era `upper`? ¿Era `uppercase`? `first_uppercase`? `capitalize`?

import jcifs.dcerpc.ndr.NdrBuffer;
import jcifs.dcerpc.ndr.NdrException;
import jcifs.dcerpc.ndr.NdrObject;
import jcifs.dcerpc.ndr.NdrSmall;

/**
 * LSA RPC (Local Security Authority Remote Procedure Call) interface definitions.
 * This class provides data structures and constants for interacting with the
 * Windows Local Security Authority service via DCE/RPC protocol.
 */
@SuppressWarnings("all")
public class lsarpc {

    /**

these terms and conditions, and the Licensor grants You such rights in
consideration of benefits the Licensor receives from making the
Licensed Material available under these terms and conditions.


Section 1 -- Definitions.

  a. Adapted Material means material subject to Copyright and Similar
     Rights that is derived from or based upon the Licensed Material
     and in which the Licensed Material is translated, altered,