* either key is null or isn't among the keys provided during construction, this method has no
   * effect.
   *
   * <p>This method is equivalent to {@code put(rowKey, columnKey, null)} when both provided keys
   * are valid.
   *
   * @param rowKey row key of mapping to be erased
   * @param columnKey column key of mapping to be erased

And multiple processes normally **don't share any memory**. This means that each running process has its own things, variables, and memory. And if you are consuming a large amount of memory in your code, **each process** will consume an equivalent amount of memory.

### Server Memory { #server-memory }

La forma en que lo usas es muy sencilla. Por ejemplo, para hacer un `GET` request, escribirías:

```Python
response = requests.get("http://example.com/some/url")
```

La operación de path equivalente en FastAPI podría verse como:

```Python hl_lines="1"
@app.get("/some/url")
def read_url():
    return {"message": "Hello World"}
```

Mira las similitudes entre `requests.get(...)` y `@app.get(...)`.

`Optional[EenType]` is eigenlijk een snelkoppeling voor `Union[EenType, None]`, ze zijn equivalent.

Dit betekent ook dat je in Python 3.10 `EenType | None` kunt gebruiken:

//// tab | Python 3.10+

```Python hl_lines="1"
{!> ../../docs_src/python_types/tutorial009_py310.py!}
```

////

Et pourtant l'expérience finale n'est pas meilleure 😞.

---

C'est donc l'histoire équivalente parallèle pour les burgers 🍔.

Pour un exemple plus courant dans la "vie réelle", imaginez une banque.

  private static int[] createFilledWithAbsent(int size) {
    int[] array = new int[size];
    Arrays.fill(array, ABSENT);
    return array;
  }

  /** Equivalent to {@code Arrays.copyOf(array, newSize)}, save that the new elements are ABSENT. */
  private static int[] expandAndFillWithAbsent(int[] array, int newSize) {
    int oldSize = array.length;

Pero aún así, la experiencia final no es la mejor. 😞

---

Esta sería la historia equivalente de las hamburguesas paralelas. 🍔

Para un ejemplo más "de la vida real" de esto, imagina un banco.

Hasta hace poco, la mayoría de los bancos tenían múltiples cajeros 👨‍💼👨‍💼👨‍💼👨‍💼 y una gran fila 🕙🕙🕙🕙🕙🕙🕙🕙.

   * multiple multisets in series.
   *
   * @since 12.0
   */
  public static class Builder<E> extends ImmutableMultiset.Builder<E> {
    /**
     * Creates a new builder. The returned builder is equivalent to the builder generated by {@link
     * ImmutableSortedMultiset#orderedBy(Comparator)}.
     */
    public Builder(Comparator<? super E> comparator) {
      super(TreeMultiset.<E>create(checkNotNull(comparator)));

  // element of the list has the short hash value h.
  //
  // A wrinkle here is that the value 0 (called UNSET in the code) is used as the equivalent of a
  // null pointer. If `table[h] == 0` that means there are no keys in the map whose short hash is h.
  // If the `next` bits in `entries[i]` are 0 that means there are no further entries for the given

            fromIterator.remove();
          }
        };
  }

  /**
   * Returns the reversed view of this converter, which converts {@code this.convert(a)} back to a
   * value roughly equivalent to {@code a}.
   *
   * <p>The returned converter is serializable if {@code this} converter is.
   *
   * <p><b>Note:</b> you should not override this method. It is non-final for legacy reasons.
   */