fake_database = initial_fake_database.copy()

initial_state = {"except": False, "finally": False}

state = initial_state.copy()

app = FastAPI()


async def get_database():
    temp_database = fake_database.copy()
    try:
        yield temp_database
        fake_database.update(temp_database)
    except HTTPException:
        state["except"] = True
        raise
    finally:
        state["finally"] = True

## Dependencias con `yield` y `except` { #dependencies-with-yield-and-except }

Si capturas una excepción usando `except` en una dependencia con `yield` y no la lanzas nuevamente (o lanzas una nueva excepción), FastAPI no podrá notar que hubo una excepción, al igual que sucedería con Python normal:

/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

/*
 * Copyright (C) 2019 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License

3.612-1.538-1.55L0 4.26 2.974 7.25 8 2.193z'/%3E%3C/svg%3E")}.accent-primary .custom-control-input:focus:not(:checked)~.custom-control-label::before,.accent-primary .custom-file-input:focus~.custom-file-label,.accent-primary .custom-select:focus,.accent-primary .form-control:focus:not(.is-invalid):not(.is-warning):not(.is-valid){border-color:#80bdff}.accent-primary .page-item .page-link{color:#007bff}.accent-primary .page-item.active .page-link,.accent-primary .page-item.active a{background-color:#007bff;...

## 含 `yield` 與 `except` 的相依 { #dependencies-with-yield-and-except }

如果你在含 `yield` 的相依中用 `except` 攔截了例外，且沒有再次拋出它（或拋出新的例外），FastAPI 將無法察覺有例外發生，就像在一般的 Python 中一樣：

{* ../../docs_src/dependencies/tutorial008c_an_py310.py hl[15:16] *}

在這種情況下，客戶端會如預期地看到一個 *HTTP 500 Internal Server Error* 回應（因為我們沒有拋出 `HTTPException` 或類似的東西），但伺服器將不會有任何日誌或其他錯誤線索。😱

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

### Dependencies with `yield` and `except`, Technical Details { #dependencies-with-yield-and-except-technical-details }

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License

## Зависимости с `yield` и `except` { #dependencies-with-yield-and-except }

Если вы ловите исключение с помощью `except` в зависимости с `yield` и не вызываете его снова (или не вызываете новое исключение), FastAPI не сможет заметить, что было исключение — так же, как это происходит в обычном Python: