*     return res;
 *   }
 * }
 * }</pre>
 *
 * @author Doug Lea
 * @author Justin T. Sampson
 * @param <E> the type of elements held in this collection
 */
@NullUnmarked
public class MonitorBasedPriorityBlockingQueue<E> extends AbstractQueue<E>
    implements BlockingQueue<E> {

  // Based on revision 1.55 of PriorityBlockingQueue by Doug Lea, from

///

Una variable de entorno (también conocida como "**env var**") es una variable que vive **fuera** del código de Python, en el **sistema operativo**, y podría ser leída por tu código de Python (o por otros programas también).

Las variables de entorno pueden ser útiles para manejar **configuraciones** de aplicaciones, como parte de la **instalación** de Python, etc.

 * but reduces variability and avoids starvation.
 *
 * <p>This class and its iterator implement all of the optional methods of the {@link
 * Collection} and {@link Iterator} interfaces.
 *
 * @author Doug Lea
 * @author Justin T. Sampson
 * @param <E> the type of elements held in this collection
 */
// TODO(kak): consider removing some of the @CanIgnoreReturnValue annotations as appropriate
@NullUnmarked

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/Striped64.java?revision=1.9
 */

package com.google.common.cache;

import com.google.common.annotations.GwtIncompatible;
import java.lang.reflect.Field;

Luego, cuando creas una instance de esa clase `Settings` (en este caso, en el objeto `settings`), Pydantic leerá las variables de entorno de una manera indiferente a mayúsculas y minúsculas, por lo que una variable en mayúsculas `APP_NAME` aún será leída para el atributo `app_name`.

Luego convertirá y validará los datos. Así que, cuando uses ese objeto `settings`, tendrás datos de los tipos que declaraste (por ejemplo, `items_per_user` será un `int`).

### Usar el `settings`

/*
 * Written by Doug Lea and Martin Buchholz with assistance from
 * members of JCP JSR-166 Expert Group and released to the public
 * domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck-jsr166e/AtomicDoubleArrayTest.java?revision=1.13
 * (Modified to adapt to guava coding conventions)
 */

package com.google.common.util.concurrent;

e&rut?walcolw??in&byr?diws,sark,?le?o&nas?tsylaib??rob&el?lam??s&als?jazel?nadg,puls?rowezrp???l&colw?e&r?vart??i&am?m???m&o&c?dar?n?tyb??s&g?iruot??t!a???n&a&gaz?nzop,?i&bul?cezczs?lbul,molow?nok?zd&eb?obeiws???u&leiw?rot,?y&tzslo?z&rtek?seic????o&c,fni?k&celo?sleib,zdolk??lkan?n&leim?pek?t&uk?yzczs??z&copo?eing?rowaj???rga?t&nokd,ua??w&ejarg?ogarm???p&e&eb,lks!emoh,??klwwortso?ohs!-ecremmoce,daerpsym,??romophcaz?s&klofc,os??t&aiwop?en?opos,ra,sezc??ude?v&irp?og!.&a&io?p?s!w???bni&p?w??ci?dtiw?...

"dar", "de", "deich", "deichniúr", "den", "dhá", "do", "don", "dtí", "dá", "dár", "dó", "faoi", "faoin", "faoina", "faoinár", "fara", "fiche", "gach", "gan", "go", "gur", "haon", "hocht", "i", "iad", "idir", "in", "ina", "ins", "inár", "is", "le", "leis", "lena", "lenár", "m'", "mar", "mo", "mé", "na", "nach", "naoi", "naonúr", "ná", "ní", "níor", "nó", "nócha", "ocht", "ochtar", "os", "roimh", "sa", "seacht", "seachtar", "seachtó", "seasca", "seisear", "siad", "sibh", "sinn", "sna", "sé", "sí", "tar",...

"dar", "de", "deich", "deichniúr", "den", "dhá", "do", "don", "dtí", "dá", "dár", "dó", "faoi", "faoin", "faoina", "faoinár", "fara", "fiche", "gach", "gan", "go", "gur", "haon", "hocht", "i", "iad", "idir", "in", "ina", "ins", "inár", "is", "le", "leis", "lena", "lenár", "m'", "mar", "mo", "mé", "na", "nach", "naoi", "naonúr", "ná", "ní", "níor", "nó", "nócha", "ocht", "ochtar", "os", "roimh", "sa", "seacht", "seachtar", "seachtó", "seasca", "seisear", "siad", "sibh", "sinn", "sna", "sé", "sí", "tar",...

 * Portions of this file are modified versions of
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck/AbstractExecutorServiceTest.java?revision=1.30
 * which contained the following notice:
 *
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,