memory!

    The best practice in OkHttp 3 is to create a single OkHttpClient instance
    and share it throughout the application. Requests that needs a customized
    client should call `OkHttpClient.newBuilder()` on that shared instance.
    This allows customization without the drawbacks of separate connection
    pools.

      nullifyWriteOrder(e);

      return next != NullEntry.INSTANCE;
    }

    @Override
    @SuppressWarnings("unchecked")
    public boolean contains(Object o) {
      ReferenceEntry<K, V> e = (ReferenceEntry<K, V>) o;
      return e.getNextInWriteQueue() != NullEntry.INSTANCE;
    }

    @Override
    public boolean isEmpty() {

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[40:45] hl[40:45] *}

Here we use the `SessionDep` dependency (a `Session`) to add the new `Hero` to the `Session` instance, commit the changes to the database, refresh the data in the `hero`, and then return it.

### Read Heroes { #read-heroes }

然后你可以声明一个变量是 `Person` 类型：

{* ../../docs_src/python_types/tutorial010_py310.py hl[6] *}

接着，你会再次获得所有的编辑器支持：

<img src="/img/python-types/image06.png">

注意，这表示“`one_person` 是类 `Person` 的一个实例（instance）”。

它并不表示“`one_person` 是名为 `Person` 的类本身（class）”。

## Pydantic 模型 { #pydantic-models }

[Pydantic](https://docs.pydantic.dev/) 是一个用于执行数据校验的 Python 库。

你将数据的“结构”声明为带有属性的类。

每个属性都有一个类型。

	return env.Get("KUBERNETES_SERVICE_HOST", "") != ""
}

// IsBOSH returns true if minio is deployed from a bosh package
func IsBOSH() bool {
	// "/var/vcap/bosh" exists in BOSH deployed instance.
	_, err := os.Stat("/var/vcap/bosh")
	if osIsNotExist(err) {
		return false
	}

	// Log error, as we will not propagate it to caller
	internalLogIf(GlobalContext, err)

	return err == nil
}

import java.util.List;
import java.util.TimeZone;

import jcifs.Configuration;
import jcifs.DialectVersion;
import jcifs.ResolverType;

/**
 * Configuration implementation that delegates to another configuration instance.
 * Provides a wrapper mechanism for configuration objects with delegation pattern.
 *
 * @author mbechler
 */
public class DelegatingConfiguration implements Configuration {

 */
public class CrawlingInfoService {

    private static final Logger logger = LogManager.getLogger(CrawlingInfoService.class);

    /**
     * Creates a new instance of CrawlingInfoService.
     */
    public CrawlingInfoService() {
    }

    /**
     * Behavior handler for CrawlingInfoParam entities.
     * Used to perform database operations on crawling session parameters.

 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
public class SmbRandomAccessFileTest {

    // Helper: build a minimally wired instance with mocks; avoids real I/O
    private SmbRandomAccessFile newInstance(String mode, boolean smb2, boolean ntSmbsCap, boolean unshared) throws CIFSException {
        SmbFile file = mock(SmbFile.class);

   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple multisets in series.
   *
   * @since 2.0
   */
  public static class Builder<E> extends ImmutableCollection.Builder<E> {
    /*
     * `contents` is null only for instances of the subclass, ImmutableSortedMultiset.Builder. That

    assertThrows(IndexOutOfBoundsException.class, () -> iia3.subArray(1, 4));
  }

  /*
   * Whenever an implementation uses `instanceof` on a parameter instance, the test has to know that
   * (so much for "black box") and try instances that both do and don't pass the check. The "don't"
   * half of that is more awkward to arrange...
   */
  private static <T> Iterable<T> iterable(Collection<T> collection) {