```Python
async with lifespan(app):
    await do_stuff()
```

When you create a context manager or an async context manager like above, what it does is that, before entering the `with` block, it will execute the code before the `yield`, and after exiting the `with` block, it will execute the code after the `yield`.

In our code example above, we don't use it directly, but we pass it to FastAPI for it to use it.

-3px;\n}\n\n.user-block.user-block-sm img {\n  width: 1.875rem;\n  height: 1.875rem;\n}\n\n.user-block.user-block-sm .username,\n.user-block.user-block-sm .description,\n.user-block.user-block-sm .comment {\n  margin-left: 40px;\n}\n\n.user-block.user-block-sm .username {\n  font-size: 14px;\n}\n\n.img-sm,\n.img-md,\n.img-lg {\n  float: left;\n}\n\n.img-sm {\n  height: 1.875rem;\n  width: 1.875rem;\n}\n\n.img-sm + .img-push {\n  margin-left: 2.5rem;\n}\n\n.img-md {\n  width: 3.75rem;\n  height: 3.75rem;\n}\n\n.img-md...

@media (max-width: 575.98px) {
	.mainLogo img {
		width: 200px;
	}
	.searchFormBox {
		margin-top: 4em;
	}
	#result .info {
		display: none;
	}
	#result .more {
		display: block;
	}
	#result .description {
		overflow: hidden;
		text-overflow: ellipsis;
		white-space: nowrap;
	}

import java.util.concurrent.SynchronousQueue
import java.util.concurrent.ThreadPoolExecutor
import java.util.concurrent.TimeUnit
import java.util.concurrent.locks.ReentrantLock
import okhttp3.internal.assertNotHeld
import okhttp3.internal.connection.Locks.withLock
import okhttp3.internal.connection.RealCall
import okhttp3.internal.connection.RealCall.AsyncCall
import okhttp3.internal.okHttpName
import okhttp3.internal.threadFactory

 */

package jcifs.smb;


@SuppressWarnings ( "javadoc" )
public interface WinError {

    /*
     * Don't bother to edit this. Everything within the interface
     * block is automatically generated from the ntstatus package.
     */

    public static final int ERROR_SUCCESS = 0;
    public static final int ERROR_ACCESS_DENIED = 5;
    public static final int ERROR_REQ_NOT_ACCEP = 71;

     * uses 10 MiB).
     */
    const val DEFAULT_INITIAL_WINDOW_SIZE = 65535

    /** HTTP/2: Size in bytes of the table used to decode the sender's header blocks. */
    const val HEADER_TABLE_SIZE = 1

    /** HTTP/2: The peer must not send a PUSH_PROMISE frame when this is 0. */
    const val ENABLE_PUSH = 2

    /** Sender's maximum number of concurrent streams. */

      case SATISFIED_BEFORE_WAITING:
        guard.setSatisfied(true);
        break;
      case SATISFIED_WHILE_WAITING:
        guard.setSatisfied(false);
        enterSatisfyGuardAndLeaveInAnotherThread(); // enter blocks until we call waitFor
        break;
      case UNSATISFIED_BEFORE_AND_WHILE_WAITING:
        guard.setSatisfied(false);
        break;
      case SATISFIED_AND_INTERRUPTED_BEFORE_WAITING:

                    int expected_max_outputs,
                    CancellationManager& cancellation_manager,
                    std::optional<int64_t> step_id = std::nullopt) const;

  // Blocks until the previous `StartExecute` has run `TFE_Execute` on each
  // device. If is_async=false (constructor argument) this means the ops have
  // run and have results. If is_async=true it means that all of the

E}|${ESCAPE_KEYCODE}`)\n\nconst Event = {\n  HIDE             : `hide${EVENT_KEY}`,\n  HIDDEN           : `hidden${EVENT_KEY}`,\n  SHOW             : `show${EVENT_KEY}`,\n  SHOWN            : `shown${EVENT_KEY}`,\n  CLICK            : `click${EVENT_KEY}`,\n  CLICK_DATA_API   : `click${EVENT_KEY}${DATA_API_KEY}`,\n  KEYDOWN_DATA_API : `keydown${EVENT_KEY}${DATA_API_KEY}`,\n  KEYUP_DATA_API   : `keyup${EVENT_KEY}${DATA_API_KEY}`\n}\n\nconst ClassName = {\n  DISABLED        : 'disabled',\n  SHOW   ...

  protected abstract <V> ListenableFuture<V> createListenableFuture(
      V value, @Nullable Exception except, CountDownLatch waitOn);

  /** Tests that the {@link Future#get()} method blocks until a value is available. */
  public void testGetBlocksUntilValueAvailable() throws Throwable {

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());