A "**callable**" in Python is anything that Python can "call" like a function.

So, if you have an object `something` (that might _not_ be a function) and you can "call" it (execute it) like:

```Python
something()
```

or

```Python
something(some_argument, some_keyword_argument="foo")
```

then it is a "callable".

## Classes as dependencies

    listeners.addListener(listener, executor);
  }

  @Override
  public String toString() {
    return getClass().getSimpleName() + " [" + state() + "]";
  }

  /**
   * Attempts to execute all the listeners in {@link #listeners} while not holding the {@link
   * #monitor}.
   */
  private void dispatchListenerEvents() {
    if (!monitor.isOccupiedByCurrentThread()) {
      listeners.dispatch();
    }

      .containsExactly("CallStart", "CallStart", "CallFailed")
  }

  private fun makeSynchronousCall(call: Call): Thread {
    val thread =
      Thread {
        try {
          call.execute()
          throw AssertionError()
        } catch (expected: IOException) {
        }
      }
    thread.start()
    return thread
  }

  private fun newRequest(url: String): Request {

///

## Motivations

Prenons un exemple simple :

{*../../docs_src/python_types/tutorial001.py*}

Exécuter ce programe affiche :

```
John Doe
```

La fonction :

* Prend un `first_name` et un `last_name`.
* Convertit la première lettre de chaque paramètre en majuscules grâce à `title()`.

                    request.addHeader(header);
                }

                HttpEntity httpEntity = null;
                try {
                    final HttpResponse response = closeableHttpClient.execute(request, new BasicHttpContext(httpClientContext));
                    httpEntity = response.getEntity();
                    consumer.accept(response, httpEntity);
                } catch (final Exception e) {

	checkTempFilesCleaned(tempCNIConfDir, t)
}

// RunInstallCNITest sets up temporary directories and runs the test.
//
// Doing a go test install_cni.go by itself will not execute the test as the
// file doesn't have a _test.go suffix, and this func doesn't start with a Test
// prefix. This func is only meant to be invoked programmatically. A separate

    List<Future<?>> results = new ArrayList<>();
    final Runnable[] manualExecutorTask = new Runnable[1];
    Executor manualExecutor =
        new Executor() {
          @Override
          public void execute(Runnable task) {
            manualExecutorTask[0] = task;
          }
        };

    results.add(serializer.submit(Callables.returning(null), manualExecutor));

        preCommands(context);
        container(context);
        lookup(context);
        init(context);
        postCommands(context);
        settings(context);
        return execute(context);
    }

    protected InvokerException handleException(LookupInvokerContext<O, R, C> context, Exception e)
            throws InvokerException {

    serverSocket!!.reuseAddress = inetSocketAddress.port != 0
    serverSocket!!.bind(inetSocketAddress, 50)

    portField = serverSocket!!.localPort

    taskRunner.newQueue().execute("MockWebServer $portField", cancelable = false) {
      try {
        logger.fine("$this starting to accept connections")
        acceptConnections()
      } catch (e: Throwable) {

* Натисніть кнопку "Try it out", це дозволить вам заповнити параметри та безпосередньо взаємодіяти з API:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

* Потім натисніть кнопку "Execute", інтерфейс користувача зв'яжеться з вашим API, надішле параметри, у відповідь отримає результати та покаже їх на екрані:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-05-swagger-04.png)