```

////

//// tab | Python 3.8+

```Python hl_lines="1  4"
{!> ../../docs_src/python_types/tutorial009.py!}
```

////

//// tab | Python 3.8+ alternative

```Python hl_lines="1  4"
{!> ../../docs_src/python_types/tutorial009b.py!}
```

////

#### Sử dụng `Union` hay `Optional`

   *
   * @since 10.0
   */
  public static final int MAX_POWER_OF_TWO = 1 << (Integer.SIZE - 2);

  /**
   * Returns a hash code for {@code value}; obsolete alternative to {@link Integer#hashCode(int)}.
   *
   * @param value a primitive {@code int} value
   * @return a hash code for the value
   */
  @InlineMe(replacement = "Integer.hashCode(value)")
  @InlineMeValidationDisabled(

   */
  // We don't use Character.BYTES here because it's not available under J2KT.
  public static final int BYTES = Character.SIZE / Byte.SIZE;

  /**
   * Returns a hash code for {@code value}; obsolete alternative to {@link
   * Character#hashCode(char)}.
   *
   * @param value a primitive {@code char} value
   * @return a hash code for the value
   */
  @InlineMe(replacement = "Character.hashCode(value)")

   */
  // The constants value gets inlined here.
  @SuppressWarnings("AndroidJdkLibsChecker")
  public static final int BYTES = Float.BYTES;

  /**
   * Returns a hash code for {@code value}; obsolete alternative to {@link Float#hashCode(float)}.
   *
   * @param value a primitive {@code float} value
   * @return a hash code for the value
   */
  @InlineMe(replacement = "Float.hashCode(value)")

 *       be overridden.
 * </ul>
 *
 * <h3>Example</h3>
 *
 * {@snippet :
 * return Converter.from(
 *     Integer::toHexString,
 *     s -> parseUnsignedInt(s, 16));
 * }
 *
 * <p>An alternative using a subclass:
 *
 * {@snippet :
 * return new Converter<Integer, String>() {
 *   @Override
 *   protected String doForward(Integer i) {
 *     return Integer.toHexString(i);
 *   }
 *

   */
  // The constants value gets inlined here.
  @SuppressWarnings("AndroidJdkLibsChecker")
  public static final int BYTES = Double.BYTES;

  /**
   * Returns a hash code for {@code value}; obsolete alternative to {@link Double#hashCode(double)}.
   *
   * @param value a primitive {@code double} value
   * @return a hash code for the value
   */
  @InlineMe(replacement = "Double.hashCode(value)")

    inappropriate.

 *  New: `HttpUrl.get(String)` is an alternative to `HttpUrl.parse(String)` that throws an exception
    when the URL is malformed instead of returning null. Use this to avoid checking for null in
    situations where the input is known to be well-formed. We've also added `MediaType.get(String)`
    which is an exception-throwing alternative to `MediaType.parse(String)`.

    Corresponding Source from a network server at no charge.

    c) Convey individual copies of the object code with a copy of the
    written offer to provide the Corresponding Source.  This
    alternative is allowed only occasionally and noncommercially, and
    only if you received the object code with such an offer, in accord
    with subsection 6b.

    d) Convey the object code by offering access from a designated

   *
   * @since 10.0
   */
  public static final long MAX_POWER_OF_TWO = 1L << (Long.SIZE - 2);

  /**
   * Returns a hash code for {@code value}; obsolete alternative to {@link Long#hashCode(long)}.
   *
   * @param value a primitive {@code long} value
   * @return a hash code for the value
   */
  @InlineMe(replacement = "Long.hashCode(value)")

func pathsJoinPrefix(prefix string, elem ...string) (paths []string) {
	paths = make([]string, len(elem))
	for i, e := range elem {
		paths[i] = pathJoin(prefix, e)
	}
	return paths
}

// string concat alternative to s1 + s2 with low overhead.
func concat(ss ...string) string {
	length := len(ss)
	if length == 0 {
		return ""
	}
	// create & allocate the memory in advance.
	n := 0
	for i := range length {