{!> ../../docs_src/query_params/tutorial002_py310.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="9"
{!> ../../docs_src/query_params/tutorial002.py!}
```

////

In this case, the function parameter `q` will be optional, and will be `None` by default.

/// check

  <K extends T, V> Map<K, V> createMap(int expectedSize) {
    switch (type) {
      case UNORDERED:
        return Maps.newHashMapWithExpectedSize(expectedSize);
      case INSERTION:
      case STABLE:
        return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
      case SORTED:
        return Maps.newTreeMap(comparator());
    }
    throw new AssertionError();
  }

  <K extends T, V> Map<K, V> createMap(int expectedSize) {
    switch (type) {
      case UNORDERED:
        return Maps.newHashMapWithExpectedSize(expectedSize);
      case INSERTION:
      case STABLE:
        return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
      case SORTED:
        return Maps.newTreeMap(comparator());
    }
    throw new AssertionError();
  }

	if len(in) == 1 {
		for {
			select {
			case <-ctxDone:
				return ctx.Err()
			case v, ok := <-in[0]:
				if !ok {
					return nil
				}
				select {
				case <-ctxDone:
					return ctx.Err()
				case out <- v:
				}
			}
		}
	}

	selectFrom := func(idx int) error {
		select {
		case <-ctxDone:
			return ctx.Err()
		case entry, ok := <-in[idx]:
			if !ok {

    @Override
    public void setRootLoggerLevel(Level level) {
        ch.qos.logback.classic.Level value;
        switch (level) {
            case DEBUG:
                value = ch.qos.logback.classic.Level.DEBUG;
                break;

            case INFO:
                value = ch.qos.logback.classic.Level.INFO;
                break;

            default:

				dm.startContinuousLockRefresh(lockLossCallback, id, source, quorum)

				return locked
			}

			switch {
			case opts.RetryInterval < 0:
				return false
			case opts.RetryInterval > 0:
				time.Sleep(opts.RetryInterval)
			default:
				attempt++
				time.Sleep(lockRetryBackOff(dm.rng, attempt))
			}
		}
	}
}

        AllocInfo inf;
        switch ( this.informationLevel ) {
        case FileSystemInformation.SMB_INFO_ALLOCATION:
            inf = new SmbInfoAllocation();
            break;
        case FileSystemInformation.FS_SIZE_INFO:
            inf = new FileFsSizeInformation();
            break;
        case FileSystemInformation.FS_FULL_SIZE_INFO:
            inf = new FileFsFullSizeInformation();

	srs.Secure = st.Secure
	switch {
	case st.Completed:
		srs.ReplicatedSize += st.TransferSize
		srs.ReplicatedCount++
		if st.TransferDuration > 0 {
			srs.Latency.update(st.TransferSize, st.TransferDuration)
			srs.updateXferRate(st.TransferSize, st.TransferDuration)
		}
	case st.Failed:
		srs.Failed.addsize(st.TransferSize, st.Err)
	case st.Pending:
	}
	sr.M[dID] = srs
}

    )
    ```

 *  New: `Response.body` is now non-null. This was generally the case in OkHttp 4.x, but the Kotlin
    type declaration was nullable to support rare cases like the body on `Response.cacheResponse`,
    `Response.networkResponse`, and `Response.priorResponse`. In such cases the body is now
    non-null, but attempts to read its content will fail.

			switch hkv.Key {
			case config.EtcdSubSys:
				off = !etcd.Enabled(item.Config)
			case config.StorageClassSubSys:
				off = !storageclass.Enabled(item.Config)
			case config.PolicyPluginSubSys:
				off = !polplugin.Enabled(item.Config)
			case config.IdentityOpenIDSubSys:
				off = !openid.Enabled(item.Config)
			case config.IdentityLDAPSubSys:
				off = !xldap.Enabled(item.Config)