Header("expect", ""),
      Header("expires", ""),
      Header("from", ""),
      Header("host", ""),
      Header("if-match", ""),
      Header("if-modified-since", ""),
      Header("if-none-match", ""),
      Header("if-range", ""),
      Header("if-unmodified-since", ""),
      Header("last-modified", ""),
      Header("link", ""),
      Header("location", ""),
      Header("max-forwards", ""),

    SerializableTester.reserializeAndAssert(Doubles.stringConverter());
  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Double> none = Arrays.<Double>asList();
    assertThat(Doubles.toArray(none)).isEqualTo(EMPTY);

    List<Double> one = Arrays.asList(1.0);
    assertThat(Doubles.toArray(one)).isEqualTo(ARRAY1);

    double[] array = {0.0, 1.0, Math.PI};

    SerializableTester.reserializeAndAssert(Longs.stringConverter());
  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Long> none = Arrays.<Long>asList();
    assertThat(Longs.toArray(none)).isEqualTo(EMPTY);

    List<Long> one = Arrays.asList(1L);
    assertThat(Longs.toArray(one)).isEqualTo(ARRAY1);

    long[] array = {0L, 1L, 0x0FF1C1AL};

    SerializableTester.reserializeAndAssert(Shorts.stringConverter());
  }

  public void testToArray() {
    // need explicit type parameter to avoid javac warning!?
    List<Short> none = Arrays.<Short>asList();
    assertThat(Shorts.toArray(none)).isEqualTo(EMPTY);

    List<Short> one = Arrays.asList((short) 1);
    assertThat(Shorts.toArray(one)).isEqualTo(ARRAY1);

    short[] array = {(short) 0, (short) 1, (short) 3};

        request = new Smb2CreateRequest(mockConfig, "test.txt");

        byte[] buffer = new byte[1024];
        request.writeBytesWireFormat(buffer, 0);

        // Check default oplock level (NONE)
        assertEquals(Smb2CreateRequest.SMB2_OPLOCK_LEVEL_NONE, buffer[3]);

        // Check default impersonation level (IMPERSONATION)

		{mustNewSignedBadMD5Request(http.MethodPut, "http://127.0.0.1:9000/", 5, bytes.NewReader([]byte("hello")), t), ErrBadDigest},
		// When request is properly signed, error is none.
		{mustNewSignedRequest(http.MethodGet, "http://127.0.0.1:9000", 0, nil, t), ErrNone},
	}

	// Validates all testcases.
	for i, testCase := range testCases {

    vbox.memory = Integer(ENV['VAGRANT_MEMORY'] || 8192)
    vbox.cpus = Integer(ENV['VAGRANT_CPUS'] || 4)

    # see https://github.com/hashicorp/vagrant/issues/9524
    vbox.customize ["modifyvm", :id, "--audio", "none"]
  end

  # Switch the default share for the project root from /vagrant to
  # /elasticsearch because /vagrant is confusing when there is a project inside
  # the elasticsearch project called vagrant....

import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

第二個參數是 [`os.getenv()`](https://docs.python.org/3.8/library/os.html#os.getenv) 的預設回傳值。

如果沒有提供，預設值為 `None`，這裡我們提供 `"World"` 作為預設值。

///

然後你可以呼叫這個 Python 程式：

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 這裡我們還沒有設定環境變數
$ python main.py

// 因為我們沒有設定環境變數，所以我們得到的是預設值

				*lri = append((*lri)[:index], (*lri)[index+1:]...)
				l.lockMap[name] = *lri
			}
			delete(l.lockUID, formatUUID(args.UID, entry.idx))
			return true
		}
	}

	// None found return false, perhaps entry removed in previous run.
	return false
}

func (l *localLocker) RLock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
	if len(args.Resources) != 1 {

set FILE_ARG=
:arg_loop
if "%~1" == "-f" (
  set "FILE_ARG=%~2"
  shift
  goto process_file_arg
)
if "%~1" == "--file" (
  set "FILE_ARG=%~2"
  shift
  goto process_file_arg
)
@REM If none of the above, skip the argument
shift
if not "%~1" == "" (
  goto arg_loop
) else (
  goto findBaseDir
)

:process_file_arg
if "%FILE_ARG%" == "" (
  goto findBaseDir
)