## In a hurry?

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

If you are using third party libraries that tell you to call them with `await`, like:

```Python
results = await some_library()
```

Then, declare your *path operation functions* with `async def` like:

```Python hl_lines="2"
@app.get('/')

Dans les versions précédentes de Javascript NodeJS / Navigateur, vous auriez utilisé des "callbacks". Menant potentiellement à ce que l'on appelle <a href="http://callbackhell.com/" class="external-link" target="_blank">le "callback hell"</a>.


## Coroutines

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falling down a very deep well.

  Either the well was very deep, or she fell very slowly, for she
had plenty of time as she went down to look about her and to
wonder what was going to happen next.  First, she tried to look
down and make out what she was coming to, but it was too dark to
see anything; then she looked at the sides of the well, and
noticed that they were filled with cupboards and book-shelves;

*/
// Following the UMD template https://github.com/umdjs/umd/blob/master/templates/returnExportsGlobal.js
(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Make globaly available as well
        define(['moment', 'jquery'], function (moment, jquery) {
            if (!jquery.fn) jquery.fn = {}; // webpack server rendering

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   background-color: lighten($dark, 10%);\n  }\n  .jsgrid-edit-row > .jsgrid-cell,\n  .jsgrid-filter-row > .jsgrid-cell,\n  .jsgrid-grid-body, .jsgrid-grid-header,\n  .jsgrid-header-row > .jsgrid-header-cell,\n  .jsgrid-insert-row > .jsgrid-cell,\n  .jsgrid-row > .jsgrid-cell,\n  .jsgrid-alt-row > .jsgrid-cell {\n    border-color: $gray-600;\n  }\n  .jsgrid-header-row > .jsgrid-header-cell,\n  .jsgrid-row > .jsgrid-cell {\n    background-color: $dark;\n  }\n  .jsgrid-alt-row > .jsgrid-cell {\n  ...

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labels.facet_filetype_image=Image
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labels.facet_filetype_javascript=JavaScript
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En versiones anteriores de NodeJS / Browser JavaScript, habrías utilizado "callbacks". Lo que conduce a <a href="http://callbackhell.com/" class="external-link" target="_blank">callback hell</a>.

## Coroutines