```{ .python .annotate hl_lines="2  10-12  14" }
{!../../docs_src/custom_response/tutorial008.py!}
```

1. This is the generator function. It's a "generator function" because it contains `yield` statements inside.
2. By using a `with` block, we make sure that the file-like object is closed after the generator function is done. So, after it finishes sending the response.

</p>

<p class="rule">
A receive from an unbuffered channel is synchronized before the completion of
the corresponding send on that channel.
</p>

<p>
This program (as above, but with the send and receive statements swapped and
using an unbuffered channel):
</p>

<pre>
var c = make(chan int)
var a string

func f() {
	a = "hello, world"
	&lt;-c
}

func main() {
	go f()
	c &lt;- 0

   *
   * <p>The use of this class is considered an implementation detail of ServiceManager and as such
   * it is excluded from {@link #servicesByState}, {@link #startupTimes}, {@link #toString} and all
   * logging statements.
   */
  private static final class NoOpService extends AbstractService {
    @Override
    protected void doStart() {
      notifyStarted();
    }

    @Override
    protected void doStop() {

   *
   * <p>The use of this class is considered an implementation detail of ServiceManager and as such
   * it is excluded from {@link #servicesByState}, {@link #startupTimes}, {@link #toString} and all
   * logging statements.
   */
  private static final class NoOpService extends AbstractService {
    @Override
    protected void doStart() {
      notifyStarted();
    }

    @Override
    protected void doStop() {

   *
   * <p>This method always throws an exception. The {@code RuntimeException} return type allows
   * client code to signal to the compiler that statements after the call are unreachable. Example
   * usage:
   *
   * <pre>
   * T doSomething() {
   *   try {
   *     return someMethodThatCouldThrowAnything();
   *   } catch (IKnowWhatToDoWithThisException e) {

	// policy, regardless of whether the number of statements is 0, this
	// includes `null`, `{}` and `{"Statement": null}`. In fact, MinIO Console
	// sends `null` when no policy is set and the intended behavior is that the
	// service account should inherit parent policy.
	//
	// However, for a policy like `{"Statement":[]}`, the intention is to not

    define_values = {"no_xla_deps_in_cuda": "true"},
    visibility = ["//visibility:public"],
)

# Crosses between framework_shared_object and a bunch of other configurations
# due to limitations in nested select() statements.
config_setting(
    name = "framework_shared_object",
    define_values = {"framework_shared_object": "true"},
    visibility = ["//visibility:public"],
)

config_setting(

    long guess = (long) Math.sqrt((double) x);
    // Note: guess is always <= FLOOR_SQRT_MAX_LONG.
    long guessSquared = guess * guess;
    // Note (2013-2-26): benchmarks indicate that, inscrutably enough, using if statements is
    // faster here than using lessThanBranchFree.
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(guessSquared == x);
        return guess;
      case FLOOR:
      case DOWN:

	// at this point.
	m.Delete(sessionPolicyNameExtracted)

	nosp := opts.sessionPolicy == nil || opts.sessionPolicy.Version == "" && len(opts.sessionPolicy.Statements) == 0

	// sessionPolicy is nil and there is embedded policy attached we remove
	// embedded policy at that point.
	if _, ok := m.Lookup(policy.SessionPolicyName); ok && nosp {
		m.Delete(policy.SessionPolicyName)

		sp, err = policy.ParseConfig(bytes.NewReader(updateReq.NewPolicy))
		if err != nil {
			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
			return
		}
		if sp.Version == "" && len(sp.Statements) == 0 {
			sp = nil
		}
	}
	opts := updateServiceAccountOpts{
		secretKey:     updateReq.NewSecretKey,
		status:        updateReq.NewStatus,
		name:          updateReq.NewName,