results = some_library()
    return results
```

---

If your application (somehow) doesn't have to communicate with anything else and wait for it to respond, use `async def`.

---

If you just don't know, use normal `def`.

---

**Note**: You can mix `def` and `async def` in your *path operation functions* as much as you need and define each one using the best option for you. FastAPI will do the right thing with them.

    #    ; updateDateFieldName = UPDATE_DATE
    #
    #    # o versionNoFieldName: (NotRequired - Default 'VERSION_NO')
    #    #  The column name of version no for optimistic lock.
    #    #  Basically you don't need this if your tables have the column 'VERSION_NO'.
    #    #  because the default value is 'VERSION_NO'.
    #    ; versionNoFieldName = VERSION_NO
    #}
    # - - - - - - - - - -/
}

        out.println(msg);
    }

    public void error(String msg, Throwable t) {
        error(msg);

        if (null != t) {
            t.printStackTrace(out);
        }
    }

    //
    // Don't need any of this
    //
    public String getName() {
        return null;
    }

    public boolean isTraceEnabled() {
        return false;
    }

    public void trace(String msg) {}

 *       #toString} behavior you expect.
 *   <li>Offers useful operations beyond just {@code get} and {@code length}, so you don't have to
 *       hunt through classes like {@link Arrays} and {@link Doubles} for them.
 *   <li>Supports a copy-free {@link #subArray} view, so methods that accept this type don't need to
 *       add overloads that accept start and end indexes.

                        classes.push('off', 'ends');

                    //don't allow selection of dates before the minimum date
                    if (this.minDate && calendar[row][col].isBefore(this.minDate, 'day'))
                        classes.push('off', 'disabled');

                    //don't allow selection of dates after the maximum date

    }

    @Override
    @CheckForNull
    protected String pendingToString() {
      InCompletionOrderState<T> localState = state;
      if (localState != null) {
        // Don't print the actual array! We don't want inCompletionOrder(list).toString() to have
        // quadratic output.
        return "inputCount=["
            + localState.inputFutures.length
            + "], remaining=["

internal class FastFallbackExchangeFinderTest {
  private val taskFaker = TaskFaker()
  private val taskRunner = taskFaker.taskRunner

  /**
   * Note that we don't use the same [TaskFaker] for this factory. That way off-topic tasks like
   * connection pool maintenance tasks don't add noise to route planning tests.
   */
  private val routePlanner = FakeRoutePlanner(taskFaker = taskFaker)

    assertThat(routeSelector.hasNext()).isFalse()
    dns.assertRequests(uriHost)
    proxySelector.assertRequests() // No proxy selector requests!
  }

  /**
   * Don't call through to the proxy selector if we don't have a host name.
   * https://github.com/square/okhttp/issues/5770
   */
  @Test fun proxySelectorNotCalledForNullHost() {

   * exercise null handling fail on those subcollections.
   */
  public abstract static class NullsBefore implements Comparator<@Nullable String>, Serializable {
    /*
     * We don't serialize this class in GWT, so we don't care about whether GWT will serialize this
     * field.
     */
    @GwtTransient private final String justAfterNull;

    protected NullsBefore(String justAfterNull) {

	// Start async collector/saver.
	// This goroutine owns the cache.
	var saverWg sync.WaitGroup
	saverWg.Add(1)
	go func() {
		// Add jitter to the update time so multiple sets don't sync up.
		updateTime := 30*time.Second + time.Duration(float64(10*time.Second)*rand.Float64())
		t := time.NewTicker(updateTime)
		defer t.Stop()
		defer saverWg.Done()
		var lastSave time.Time

		for {