// returns, won't affect the copy of `func`/`grad` in `g`.
// If `func` or `grad` are already in `g`, TF_GraphCopyFunction has no
// effect on them, but can establish the function->gradient relationship
// between them if `func` does not already have a gradient. If `func` already
// has a gradient different from `grad`, an error is returned.
//
// `func` must not be null.

        rawSocket?.closeQuietly()
      }
    }
  }

  override fun connectTlsEtc(): ConnectResult {
    val rawSocket = requireNotNull(rawSocket) { "TCP not connected" }
    check(!isReady) { "already connected" }

    val connectionSpecs = route.address.connectionSpecs
    var retryTlsConnection: ConnectPlan? = null
    var success = false

   */
  void remove(Range<K> range);

  /**
   * Merges a value into a part of the map by applying a remapping function.
   *
   * <p>If any parts of the range are already present in this map, those parts are mapped to new
   * values by applying the remapping function. The remapping function accepts the map's existing

     *
     * @param project the project
     * @return the project's weight (higher means longer dependency chain)
     */
    public long getProjectWeight(MavenProject project) {
        // First check if weight is already calculated
        Long existingWeight = projectWeights.get(project);
        if (existingWeight != null) {
            return existingWeight;
        }

**FastAPI** is all based on these type hints, they give it many advantages and benefits.

But even if you never use **FastAPI**, you would benefit from learning a bit about them.

/// note

If you are a Python expert, and you already know everything about type hints, skip to the next chapter.

///

## Motivation { #motivation }

Let's start with a simple example:

{* ../../docs_src/python_types/tutorial001_py39.py *}

   */
  private void startTask() {
    synchronized (lock) {
      if (shutdown) {
        throw new RejectedExecutionException("Executor already shutdown");
      }
      runningTasks++;
    }
  }

  /** Decrements the running task count. */
  private void endTask() {
    synchronized (lock) {
      int numRunning = --runningTasks;

    // Manually write an invalid masked close frame.
    server.sink.write("888760b420bb635c68de0cd84f".decodeHex()).emit()
    client.processNextFrame() // Detects error, disconnects immediately since close already sent.
    client.webSocket!!.finishReader()
    taskFaker.runTasks()
    assertThat(client.closed).isTrue()
    client.listener.assertFailure(
      ProtocolException::class.java,

### Return values { #return-values }

And they can return values or not, the values won't be used.

So, you can reuse a normal dependency (that returns a value) you already use somewhere else, and even though the value won't be used, the dependency will be executed:

{* ../../docs_src/dependencies/tutorial006_an_py39.py hl[11,16] *}

```

</div>

Then deploy your app:

<div class="termy">

```console
$ fastapi deploy

Deploying to FastAPI Cloud...

✅ Deployment successful!

🐔 Ready the chicken! Your app is ready at https://myapp.fastapicloud.dev
```

</div>

That's it! Now you can access your app at that URL. ✨

## Recap, step by step { #recap-step-by-step }

       *   user task -- which means that we already got past this code (or else we exited early
       *   above))
       */
      // Unconditionally set; there is no risk of throwing away a queued task from another thread,
      // because in order for the current task to run on this executor the previous task must have
      // already started execution. Because each task on a TaskNonReentrantExecutor can only produce