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  2. github.com/tiangolo/fastapi

    docs_src/body_multiple_params/tutorial003_an_py39.py 

    Sebastián Ramírez <******@****.***> 1679142599 +0100
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
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  3. github.com/tiangolo/fastapi

    docs_src/body_multiple_params/tutorial004_an_py39.py 

    Sebastián Ramírez <******@****.***> 1679142599 +0100
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Mar 18 12:29:59 GMT 2023
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  4. github.com/tiangolo/fastapi

    docs_src/cookie_param_models/tutorial002_an_py39.py 

    Sebastián Ramírez <******@****.***> 1726599250 +0200
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Sep 17 18:54:10 GMT 2024
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  5. github.com/tiangolo/fastapi

    docs_src/extra_data_types/tutorial001_an_py39.py 

    Nils Lindemann <******@****.***> 1713485500 +0200
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Apr 19 00:11:40 GMT 2024
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  6. github.com/tiangolo/fastapi

    docs_src/header_param_models/tutorial001_an_py39.py 

    Sebastián Ramírez <******@****.***> 1726599250 +0200
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Sep 17 18:54:10 GMT 2024
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  7. github.com/tiangolo/fastapi

    docs_src/query_params_str_validations/tutorial002_an_py39.py 

    Sebastián Ramírez <******@****.***> 1766004103 -0800
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
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  8. github.com/tiangolo/fastapi

    docs_src/path_params_numeric_validations/tutorial006_an_py39.py 

    Muhammad Ashiq Ameer <******@****.***> 1724888355 +0530
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Aug 28 23:39:15 GMT 2024
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  9. github.com/tiangolo/fastapi

    docs_src/dependencies/tutorial008c_an_py39.py 

    Sebastián Ramírez <******@****.***> 1708815997 +0100
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Feb 24 23:06:37 GMT 2024
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  10. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/dependencies/dependencies-with-yield.md 

    例如，`dependency_c` 可以依赖于 `dependency_b`，而 `dependency_b` 则依赖于 `dependency_a`。

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

所有这些依赖都可以使用 `yield`。

在这种情况下，`dependency_c` 在执行其退出代码时需要 `dependency_b`（此处称为 `dep_b`）的值仍然可用。

而 `dependency_b` 反过来则需要 `dependency_a`（此处称为 `dep_a` ）的值在其退出代码中可用。

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[18:19,26:27] *}

同样，你可以混合使用带有 `yield` 或 `return` 的依赖。

你也可以声明一个依赖于多个带有 `yield` 的依赖，等等。
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Mon Nov 18 02:25:44 GMT 2024
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  11. github.com/tiangolo/fastapi

    docs/en/docs/tutorial/query-params-str-validations.md 

    ```

So, when you need to declare a value as required while using `Query`, you can simply not declare a default value:

{* ../../docs_src/query_params_str_validations/tutorial006_an_py39.py hl[9] *}

### Required, can be `None` { #required-can-be-none }
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Dec 20 15:55:38 GMT 2025
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