### Что такое "контекстные менеджеры"

"Контекстные менеджеры" - это любые объекты Python, которые можно использовать в операторе `with`.

Например, <a href="https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files" class="external-link" target="_blank">можно использовать `with` для чтения файла</a>:

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

			fd := int(wl.Netns.Fd())
			log.Infof("sending pod to ztunnel as part of snapshot")
			resp, err = conn.sendMsgAndWaitForAck(&zdsapi.WorkloadRequest{
				Payload: &zdsapi.WorkloadRequest_Add{
					Add: &zdsapi.AddWorkload{
						Uid:          uid,
						WorkloadInfo: wl.Workload,
					},
				},
			}, &fd)
		} else {
			log.Infof("netns is not available for pod, sending 'keep' to ztunnel")

		}
	}

	contentBytes, err := io.ReadAll(resp.Body)
	if err != nil {
		return content, AdminError{
			Code:       AdminUpdateUnexpectedFailure,
			Message:    fmt.Sprintf("Error reading response. %s", err),
			StatusCode: http.StatusInternalServerError,
		}
	}

	return string(contentBytes), nil
}

func releaseInfoToReleaseTime(releaseInfo string) (releaseTime time.Time, err error) {

	for _, f := range args {
		var r *os.File

		// Handle "-" as stdin as a special case.
		if f == "-" {
			if isatty.IsTerminal(os.Stdin.Fd()) && !isJSONorYAMLOutputFormat() {
				fmt.Fprint(cmd.OutOrStdout(), "Reading from stdin:\n")
			}
			r = os.Stdin
			readers = append(readers, local.ReaderSource{Name: f, Reader: r})
			continue
		}

		fi, err := os.Stat(f)
		if err != nil {
			return nil, err
		}

### O que são gerenciadores de contexto

"Gerenciadores de Contexto" são qualquer um dos objetos Python que podem ser utilizados com a declaração `with`.

Por exemplo, <a href="https://docs.python.org/3/tutorial/inputoutput.html#reading-and-writing-files" class="external-link" target="_blank">você pode utilizar `with` para ler um arquivo</a>:

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

   * the traverser cannot guarantee that it will not follow symbolic links to directories as it is
   * possible for a directory to be replaced with a symbolic link between checking if the file is a
   * directory and actually reading the contents of that directory.
   *
   * <p>If the {@link Path} passed to one of the traversal methods does not exist or is not a
   * directory, no exception will be thrown and the returned {@link Iterable} will contain a single

   * the traverser cannot guarantee that it will not follow symbolic links to directories as it is
   * possible for a directory to be replaced with a symbolic link between checking if the file is a
   * directory and actually reading the contents of that directory.
   *
   * <p>If the {@link Path} passed to one of the traversal methods does not exist or is not a
   * directory, no exception will be thrown and the returned {@link Iterable} will contain a single

		// Buffer size greater than object size. - 6
		{
			volume, "myobject", 0, 16,
			[]byte("hello, world"),
			io.ErrUnexpectedEOF,
		},
		// Reading from an offset success. - 7
		{
			volume, "myobject", 7, 5,
			[]byte("world"), nil,
		},
		// Reading from an object but buffer size greater. - 8
		{
			volume, "myobject",
			7, 8,
			[]byte("world"),
			io.ErrUnexpectedEOF,
		},

    val editor = cache.edit("k1")!!
    assertThat(cache["k1"]).isNull()
    editor.commit()
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun `Windows cannot write while reading`(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    Assumptions.assumeTrue(windows)

    set("k1", "a", "a")
    val snapshot = cache["k1"]!!

* `Field(index=True)` tells SQLModel that it should create a **SQL index** for this column, that would allow faster lookups in the database when reading data filtered by this column.

    SQLModel will know that something declared as `str` will be a SQL column of type `TEXT` (or `VARCHAR`, depending on the database).

### Create an Engine