{* ../../docs_src/first_steps/tutorial001_py39.py hl[6] *}

El `@app.get("/")` le dice a **FastAPI** que la función justo debajo se encarga de manejar requests que vayan a:

* el path `/`
* usando una <abbr title="un método HTTP GET"><code>get</code> operation</abbr>

/// info | Información sobre `@decorator`

Esa sintaxis `@algo` en Python se llama un "decorador".

      while (true) {
        try {
          return future.get();
        } catch (InterruptedException e) {
          interrupted = true;
        }
      }
    } finally {
      if (interrupted) {
        Thread.currentThread().interrupt();
      }
    }
  }

  /**
   * Invokes {@code future.}{@link Future#get(long, TimeUnit) get(timeout, unit)} uninterruptibly.
   *
   * <p>Similar methods:

// LookupSite - get site related configuration. Loads configuration from legacy
// region sub-system as well.
func LookupSite(siteKV KVS, regionKV KVS) (s Site, err error) {
	if err = CheckValidKeys(SiteSubSys, siteKV, DefaultSiteKVS); err != nil {
		return s, err
	}
	region := env.Get(EnvRegion, "")
	if region == "" {
		env.Get(EnvRegionName, "")
	}
	if region == "" {

   * </ul>
   *
   * <p>The result is guaranteed to be in the "traditional", lexicographical order for Cartesian
   * products that you would get from nesting for loops:
   *
   * {@snippet :
   * for (B b0 : lists.get(0)) {
   *   for (B b1 : lists.get(1)) {
   *     ...
   *     ImmutableList<B> tuple = ImmutableList.of(b0, b1, ...);
   *     // operate on tuple
   *   }
   * }
   * }
   *

from fastapi import FastAPI

app = FastAPI()


@app.get("/app")
def read_main():
    return {"message": "Hello World from main app"}


subapi = FastAPI()


@subapi.get("/sub")
def read_sub():
    return {"message": "Hello World from sub API"}

        };

    AsyncCallable<String> asyncCallable =
        Callables.asAsyncCallable(callable, newDirectExecutorService());

    ListenableFuture<String> future = asyncCallable.call();
    assertSame(expected, future.get());
  }

  @J2ktIncompatible
  @GwtIncompatible
  public void testAsAsyncCallable_exception() throws Exception {
    Exception expected = new IllegalArgumentException();
    Callable<String> callable =

        operationErrors.incrementAndGet();
    }
    
    public double getErrorRate() {
        long total = rdmaReads.get() + rdmaWrites.get() + rdmaSends.get() + rdmaReceives.get();
        if (total == 0) return 0.0;
        return (double) operationErrors.get() / total;
    }
    
    // Getters for all statistics...
}
```

## 9. Error Handling and Fallback

   *   <li><i>consistency</i>: {@code comparator.compare(ti, tj) < 0} and {@code
   *       comparator.compare(tj, ti) > 0} for {@code i < j}, where {@code ti =
   *       valuesInExpectedOrder.get(i)} and {@code tj = valuesInExpectedOrder.get(j)}.
   * </ul>
   */
  public static <T extends @Nullable Object> void testComparator(
      Comparator<? super T> comparator, List<T> valuesInExpectedOrder) {

        String localRepoHead = mergedProps.get(Constants.MAVEN_REPO_LOCAL_HEAD);
        if (localRepoHead != null) {
            Arrays.stream(localRepoHead.split(","))
                    .filter(p -> p != null && !p.trim().isEmpty())
                    .map(this::resolve)
                    .forEach(paths::add);
        }
        paths.add(Paths.get(request.getLocalRepository().getBasedir()));

from fastapi import FastAPI, Path

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(q: str, item_id: int = Path(title="The ID of the item to get")):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})