Maybe you need to start a new version, or you just got tired of running it. 🤷

### Lifespan function

The first thing to notice, is that we are defining an async function with `yield`. This is very similar to Dependencies with `yield`.

```Python hl_lines="14-19"
{!../../../docs_src/events/tutorial003.py!}
```

The first part of the function, before the `yield`, will be executed **before** the application starts.

[type="reset"], [type="search"]',d={upper:function(a){return a.toLocaleUpperCase()},lower:function(a){return a.toLocaleLowerCase()},trim:function(b){return a.trim(b)},trimLeft:function(a){return a.replace(/^\s+/,"")},trimRight:function(a){return a.replace(/\s+$/,"")},capitalize:function(b){var c=b.split(" ");return a.each(c,function(a,b){c[a]=b.substr(0,1).toUpperCase()+b.substr(1,b.length)}),c.join(" ")},insert:function(a,b,c){var d=(b.attr("data-sanitize-insert-"+c)||"").replace(/\[SPACE\]/g," ");r...

      Function<? super F, ? extends @Nullable T> function, Equivalence<T> resultEquivalence) {
    this.function = checkNotNull(function);
    this.resultEquivalence = checkNotNull(resultEquivalence);
  }

  @Override
  protected boolean doEquivalent(F a, F b) {
    return resultEquivalence.equivalent(function.apply(a), function.apply(b));
  }

  @Override
  protected int doHash(F a) {

 *  @website http://formvalidator.net/
 *  @author Victor Jonsson, http://victorjonsson.se
 *  @license MIT
 */

  var IMG_LOADING_DELAY = 200;
  var IMG_LOADING_MAX = 0;
  loadImage = function(img, url, limit) {
    var imgData = new Image();
    $(imgData).on("load", function() {
      $(img).css("background-image", "");
      $(img).attr("src", url);
    });
    $(imgData).on("error", function() {
      if (limit > 0) {
        setTimeout(function() {
          loadImage(img, url, --limit);
        }, IMG_LOADING_DELAY);

          V,
          I extends Table<R, C, V>>
      Collector<T, ?, I> toTable(
          java.util.function.Function<? super T, ? extends R> rowFunction,
          java.util.function.Function<? super T, ? extends C> columnFunction,
          java.util.function.Function<? super T, ? extends V> valueFunction,
          java.util.function.Supplier<I> tableSupplier) {
    return TableCollectors.<T, R, C, V, I>toTable(
        rowFunction,

```Python hl_lines="14"
{!../../../docs_src/background_tasks/tutorial001.py!}
```

`.add_task()` receives as arguments:

* A task function to be run in the background (`write_notification`).
* Any sequence of arguments that should be passed to the task function in order (`email`).

 *  @license MIT
 */

 *  @license MIT
 */

$(function() {
  var $searchButton = $("#searchButton"),
      contextPath = $("#contextPath").val();

  $("#searchForm").on("submit", function(e) {
    $searchButton.attr("disabled", true);
    setTimeout(function() {
      $searchButton.attr("disabled", false);
    }, 3000);
    return true;
  });

  $(document).on("click touchend", function(e) {
    if (!$(e.target).closest("#searchOptions, [data-toggle='control-options']").length) {