from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### 📁

🔜 🎏 🏗 📁 ✍ 📁 `Dockerfile` ⏮️:

```{ .dockerfile .annotate }
# (1)
FROM python:3.9

# (2)
WORKDIR /code

 * Specification, Chapter 3</a>.
 *
 * <p>The variant of UTF-8 implemented by this class is the restricted definition of UTF-8
 * introduced in Unicode 3.1. One implication of this is that it rejects <a
 * href="http://www.unicode.org/versions/corrigendum1.html">"non-shortest form"</a> byte sequences,
 * even though the JDK decoder may accept them.
 *
 * @author Martin Buchholz

     * when we run AbstractFutureTest itself.
     */

    /*
     * We don't test UnsafeAtomicHelper here, since guava-android doesn't provide a way to use it
     * under the JVM. (We could arrange for one if we really wanted, but that will break once the
     * JDK further restricts access to Unsafe.) But we have coverage under an Android emulator,
     * which uses UnsafeAtomicHelper when it runs AbstractFutureTest itself.
     */

import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.Collection;
import org.jspecify.annotations.Nullable;

/**
 * An implementation of {@link ContiguousSet} that contains one or more elements.
 *
 * @author Gregory Kick
 */
@GwtCompatible
@SuppressWarnings("rawtypes") // https://github.com/google/guava/issues/989
final class RegularContiguousSet<C extends Comparable> extends ContiguousSet<C> {

    try {
      executor.execute(runnable);
    } catch (Exception e) { // sneaky checked exception
      // Log it and keep going -- bad runnable and/or executor. Don't punish the other runnables if
      // we're given a bad one. We only catch Exception because we want Errors to propagate up.
      log.get()
          .log(
              Level.SEVERE,
              "RuntimeException while executing runnable "
                  + runnable

			[]error{
				errFileNotFound, errFileNotFound, errFileNotFound,
				errFileNotFound, errFileNotFound, nil, nil, nil, nil, nil,
			},
			nil, nil,
		},
		// Checks if wrapped context cancellation errors are grouped as one.
		{canceledErrs, nil, context.Canceled},
	}
	// Validates list of all the testcases for returning valid errors.
	for i, testCase := range testCases {

	}

	err = os.RemoveAll(path.Join(fsDirs[0], bucket, object, "xl.meta"))
	if err != nil {
		t.Fatal(err)
	}

	// Write xl.meta with different modtime to simulate the case where a disk had
	// gone down when an object was replaced by a new object.
	fileInfoOutDated := fileInfoPreHeal
	fileInfoOutDated.ModTime = time.Now()
	err = disk.WriteMetadata(t.Context(), "", bucket, object, fileInfoOutDated)
	if err != nil {

    if (!range.hasLowerBound() && !range.hasUpperBound()) {
      // We can do this in O(n) rather than removing one by one, which could force rebalancing.
      for (AvlNode<E> current = header.succ(); current != header; ) {
        AvlNode<E> next = current.succ();

        current.elemCount = 0;
        // Also clear these fields so that one deleted Entry doesn't retain all elements.
        current.left = null;
        current.right = null;

    LoadingCache<String, Integer> cache =
        CacheBuilder.newBuilder().removalListener(countingRemovalListener()).build(loader);

    assertEquals(Integer.valueOf(1), cache.getUnchecked("one"));
    assertEquals(1, cache.size());
  }

  public void testInitialCapacity_negative() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();

    LoadingCache<String, Integer> cache =
        CacheBuilder.newBuilder().removalListener(countingRemovalListener()).build(loader);

    assertEquals(Integer.valueOf(1), cache.getUnchecked("one"));
    assertEquals(1, cache.size());
  }

  public void testInitialCapacity_negative() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();