`str`, `int`, `float` vb. normal tekil tiplerin yanında, `str`’den türeyen daha karmaşık tekil tipleri de kullanabilirsiniz.

Tüm seçenekleri görmek için [Pydantic Türlerine Genel Bakış](https://docs.pydantic.dev/latest/concepts/types/) sayfasına göz atın. Sonraki bölümde bazı örnekleri göreceksiniz.

        // Verify field initialization through toString
        String str = notifyChange.toString();
        assertTrue(str.contains("NtTransNotifyChange"));
        assertTrue(str.contains("fid=0x" + Hexdump.toHexString(fid, 4)));
        assertTrue(str.contains("filter=0x" + Hexdump.toHexString(completionFilter, 4)));
        assertTrue(str.contains("watchTree=" + watchTree));
    }

    @Test

@pytest.fixture(name="client")
def get_client():
    from enum import Enum

    app = FastAPI()

    class PlatformRole(str, Enum):
        admin = "admin"
        user = "user"

    class OtherRole(str, Enum): ...

    class User(BaseModel):
        username: str
        role: PlatformRole | OtherRole

    @app.get("/users")
    async def get_user() -> User:

from fastapi import BackgroundTasks, Depends, FastAPI

app = FastAPI()


def write_log(message: str):
    with open("log.txt", mode="a") as log:
        log.write(message)


def get_query(background_tasks: BackgroundTasks, q: str | None = None):
    if q:
        message = f"found query: {q}\n"
        background_tasks.add_task(write_log, message)
    return q


@app.post("/send-notification/{email}")

class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )


async def get_current_user(token: str = Depends(oauth2_scheme)):
    user = fake_decode_token(token)

class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )


async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]):
    user = fake_decode_token(token)

from typing import Annotated

from fastapi import Body, FastAPI
from pydantic import BaseModel, Field

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = Field(
        default=None, title="The description of the item", max_length=300
    )
    price: float = Field(gt=0, description="The price must be greater than zero")
    tax: float | None = None


@app.put("/items/{item_id}")

    pass


def get_username():
    try:
        yield "Rick"
    except InternalError:
        print("Oops, we didn't raise again, Britney 😱")


@app.get("/items/{item_id}")
def get_item(item_id: str, username: str = Depends(get_username)):
    if item_id == "portal-gun":
        raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":

app = FastAPI()


@app.post("/file_before_form")
def file_before_form(
    file: bytes = File(),
    city: str = Form(),
):
    return {"file_content": file, "city": city}


@app.post("/file_after_form")
def file_after_form(
    city: str = Form(),
    file: bytes = File(),
):
    return {"file_content": file, "city": city}


@app.post("/file_list_before_form")

        assertNotNull(querySecurityDesc);

        // Test toString contains the expected values to verify field initialization
        String str = querySecurityDesc.toString();
        assertTrue(str.contains("fid=0x" + Hexdump.toHexString(fid, 4)));
        assertTrue(str.contains("securityInformation=0x" + Hexdump.toHexString(securityInfo, 8)));
    }

    @Test