```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

Im Hintergrund erstellt das `open("./somefile.txt")` ein Objekt, das als „Kontextmanager“ bezeichnet wird.

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

Под капотом" open("./somefile.txt") создаёт объект называемый "контекстным менеджером".

Когда блок `with` завершается, он обязательно закрывает файл, даже если были исключения.

   * X-Download-Options}</a> header field name.
   *
   * <p>When the new X-Download-Options header is present with the value {@code noopen}, the user is
   * prevented from opening a file download directly; instead, they must first save the file
   * locally.
   *
   * @since 24.1
   */

            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcLsarClose.class));

        // Act
        handle.close();

        // Assert
        // Verify sendrecv was called once for open and once for close
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarClose.class));
    }

    @Test

So, it was a complete additional system.

It is not very popular or used nowadays.

## OpenAPI { #openapi }

OpenAPI (previously known as Swagger) is the open specification for building APIs (now part of the Linux Foundation).

**FastAPI** is based on **OpenAPI**.

That's what makes it possible to have multiple automatic interactive documentation interfaces, code generation, etc.

/// tip

Als je Python 3.9 of hoger gebruikt, hoef je `List` niet te importeren uit `typing`, je kunt in plaats daarvan hetzelfde reguliere `list` type gebruiken.

///

Door dat te doen, kan je editor ondersteuning bieden, zelfs tijdens het verwerken van items uit de list:

<img src="/img/python-types/image05.png">

Zonder types is dat bijna onmogelijk om te bereiken.

* It returns an object of type `HTTPBasicCredentials`:
    * It contains the `username` and `password` sent.

{* ../../docs_src/security/tutorial006_an_py39.py hl[4,8,12] *}

When you try to open the URL for the first time (or click the "Execute" button in the docs) the browser will ask you for your username and password:

<img src="/img/tutorial/security/image12.png">

## Check the username { #check-the-username }

transparent}.dropup .dropdown-toggle:empty::after{margin-left:0}.dropend .dropdown-menu[data-bs-popper]{top:0;right:auto;left:100%;margin-top:0;margin-left:var(--bs-dropdown-spacer)}.dropend .dropdown-toggle::after{display:inline-block;margin-left:.255em;vertical-align:.255em;content:"";border-top:.3em solid transparent;border-right:0;border-bottom:.3em solid transparent;border-left:.3em solid}.dropend .dropdown-toggle:empty::after{margin-left:0}.dropend .dropdown-toggle::after{vertical-align:0}.dropstart ....

        /** The SAM server handle */
        public rpc.policy_handle handle;
        /** The desired access rights to the domain */
        public int access_mask;
        /** The SID of the domain to open */
        public rpc.sid_t sid;
        /** The returned handle to the domain */
        public rpc.policy_handle domain_handle;

        /**
         * Constructs a SamrOpenDomain request.
         *

        /** The SAM server handle */
        public rpc.policy_handle handle;
        /** The desired access rights to the domain */
        public int access_mask;
        /** The SID of the domain to open */
        public rpc.sid_t sid;
        /** The returned handle to the domain */
        public rpc.policy_handle domain_handle;

        /**
         * Constructs a SamrOpenDomain request.
         *