Digamos que você tenha uma classe `Person`, com um nome:

{* ../../docs_src/python_types/tutorial010.py hl[1:3] *}

Então você pode declarar que uma variável é do tipo `Person`:

{* ../../docs_src/python_types/tutorial010.py hl[6] *}

E então, novamente, você recebe todo o suporte do editor:

<img src="/img/python-types/image06.png">

### Validation { #validation }

* Validation for most (or all?) Python **data types**, including:
    * JSON objects (`dict`).
    * JSON array (`list`) defining item types.
    * String (`str`) fields, defining min and max lengths.
    * Numbers (`int`, `float`) with min and max values, etc.

* Validation for more exotic types, like:
    * URL.
    * Email.
    * UUID.
    * ...and others.

        assertEquals(14, totalWritten); // 4 header + 10 trailer
        assertEquals((byte) SessionServicePacket.SESSION_MESSAGE, dst[0]);
    }

    @Test
    @DisplayName("writeWireFormat should handle large lengths correctly")
    void testWriteWireFormatLargeLength() {
        packet.type = SessionServicePacket.SESSION_MESSAGE;
        packet.trailerLength = 0x10000; // Length requiring extended bit

* Validatie voor de meeste (of misschien wel alle?) Python **datatypes**, inclusief:
    * JSON objecten (`dict`).
    * JSON array (`list`) die itemtypes definiëren.
    * String (`str`) velden, die min en max lengtes hebben.
    * Getallen (`int`, `float`) met min en max waarden, enz.

* Validatie voor meer exotische typen, zoals:
    * URL.
    * E-mail.
    * UUID.
    * ...en anderen.

import java.net.UnknownHostException;
import java.util.Properties;
import java.util.StringTokenizer;

import jcifs.smb1.util.LogStream;

/**
 * This class uses a static {@link java.util.Properties} to act
 * as a cental repository for all jCIFS configuration properties. It cannot be
 * instantiated. Similar to <code>System</code> properties the namespace
 * is global therefore property names should be unique. Before use,

**FastAPI** é totalmente compatível com (e baseado no) <a href="https://www.starlette.io/" class="external-link" target="_blank"><strong>Starlette</strong></a>. Então, qualquer código adicional Starlette que você tiver, também funcionará.

`FastAPI` é na verdade uma sub-classe do `Starlette`. Então, se você já conhece ou usa Starlette, a maioria das funcionalidades se comportará da mesma forma.

        }
    }

    @Nested
    @DisplayName("Size Calculation Tests")
    class SizeTests {

        @ParameterizedTest
        @DisplayName("Should calculate correct size for various path lengths")
        @CsvSource({ "'', 4", "'a', 6", "'\\\\', 8", "'\\\\server', 20", "'\\\\server\\share', 32", "'\\\\server\\share\\path', 42",
                "'\\\\server\\share\\very\\long\\path\\with\\many\\segments', 100" })

        int paramWritten = trans2QueryFSInfo.writeParametersWireFormat(paramBuffer, 0);
        int dataWritten = trans2QueryFSInfo.writeDataWireFormat(dataBuffer, 0);

        // Verify lengths
        assertEquals(2, setupWritten);
        assertEquals(2, paramWritten);
        assertEquals(0, dataWritten);

        // Verify setup content

        int paramWritten = trans2SetFileInfo.writeParametersWireFormat(paramBuffer, 0);
        int dataWritten = trans2SetFileInfo.writeDataWireFormat(dataBuffer, 0);

        // Verify lengths
        assertEquals(2, setupWritten);
        assertEquals(6, paramWritten);
        assertEquals(56, dataWritten); // 50 + 6 padding

        // Verify setup content

            assertTrue(utf16Bytes.length > 0, "UTF-16LE bytes should not be empty");
            assertNotEquals(utf8Bytes.length, utf16Bytes.length, "Different encodings should produce different lengths");
        }

        @ParameterizedTest
        @DisplayName("getBytes should handle various string inputs")
        @NullAndEmptySource