<img src="/img/tutorial/extending-openapi/image03.png">

## Change the Theme

The same way you could set the syntax highlighting theme with the key `"syntaxHighlight.theme"` (notice that it has a dot in the middle):

```Python hl_lines="3"
{!../../../docs_src/configure_swagger_ui/tutorial002.py!}
```

That configuration would change the syntax highlighting color theme:

import okhttp3.internal.platform.Platform
import okio.IOException

class RealConnectionPool(
  private val taskRunner: TaskRunner,
  /**
   * The maximum number of idle connections across all addresses.
   * Connections needed to satisfy a [ConnectionPool.AddressPolicy] are not considered idle.
   */
  private val maxIdleConnections: Int,
  keepAliveDuration: Long,
  timeUnit: TimeUnit,
  internal val connectionListener: ConnectionListener,

import (
	"context"
	"math"
)

const (
	sysCPUAvgIdle   = "avg_idle"
	sysCPUAvgIOWait = "avg_iowait"
	sysCPULoad      = "load"
	sysCPULoadPerc  = "load_perc"
	sysCPUNice      = "nice"
	sysCPUSteal     = "steal"
	sysCPUSystem    = "system"
	sysCPUUser      = "user"
)

var (
	sysCPUAvgIdleMD   = NewGaugeMD(sysCPUAvgIdle, "Average CPU idle time")
	sysCPUAvgIOWaitMD = NewGaugeMD(sysCPUAvgIOWait, "Average CPU IOWait time")

  /** Returns the number of idle connections in the pool. */
  fun idleConnectionCount(): Int = delegate.idleConnectionCount()

  /** Returns total number of connections in the pool. */
  fun connectionCount(): Int = delegate.connectionCount()

  internal val connectionListener: ConnectionListener
    get() = delegate.connectionListener

  /** Close and remove all idle connections in the pool. */
  fun evictAll() {

    }

  /**
   * A callback to be invoked each time the dispatcher becomes idle (when the number of running
   * calls returns to zero).
   *
   * Note: The time at which a [call][Call] is considered idle is different depending on whether it
   * was run [asynchronously][Call.enqueue] or [synchronously][Call.execute]. Asynchronous calls
   * become idle after the [onResponse][Callback.onResponse] or [onFailure][Callback.onFailure]

        // If starts with '**', adding a '^' to the regular expression also works
        /^(?=[^^])/,
        function startingReplacer () {
            // If has a slash `/` at the beginning or middle
            return !/\/(?!$)/.test(this)
                // > Prior to 2.22.1
                // > If the pattern does not contain a slash /,
                // >   Git treats it as a shell glob pattern

* Converts the first letter of each one to upper case with `title()`.
* <abbr title="Puts them together, as one. With the contents of one after the other.">Concatenates</abbr> them with a space in the middle.

```Python hl_lines="2"
{!../../../docs_src/python_types/tutorial001.py!}
```

### Edit it

It's a very simple program.

But now imagine that you were writing it from scratch.

  }

  @Test
  fun idleCallbackInvokedWhenIdle() {
    val idle = AtomicBoolean()
    dispatcher.idleCallback = Runnable { idle.set(true) }
    client.newCall(newRequest("http://a/1")).enqueue(callback)
    client.newCall(newRequest("http://a/2")).enqueue(callback)
    executor.finishJob("http://a/1")
    assertThat(idle.get()).isFalse()
    val ready = CountDownLatch(1)
    val proceed = CountDownLatch(1)

				if ts != nil {
					tot := ts.User + ts.System + ts.Idle + ts.Iowait + ts.Nice + ts.Steal
					cpuUserVal := math.Round(ts.User/tot*100*100) / 100
					updateResourceMetrics(cpuSubsystem, cpuUser, cpuUserVal, labels, false)
					cpuSystemVal := math.Round(ts.System/tot*100*100) / 100
					updateResourceMetrics(cpuSubsystem, cpuSystem, cpuSystemVal, labels, false)
					cpuIdleVal := math.Round(ts.Idle/tot*100*100) / 100

                                  format: int32
                                  type: integer
                                idleTimeout:
                                  description: The idle timeout for upstream connection
                                    pool connections.
                                  type: string
                                maxConcurrentStreams: