有些型別可以在方括號中接收「型別參數」，以定義其內部元素的型別，例如「字串的 list」可以宣告為 `list[str]`。

這些能接收型別參數的型別稱為「泛型（Generic types）」或「Generics」。

你可以將相同的內建型別用作泛型（使用方括號並在裡面放型別）：

* `list`
* `tuple`
* `set`
* `dict`

#### List { #list }

例如，讓我們定義一個變數是 `str` 的 `list`。

宣告變數，使用相同的冒號（`:`）語法。

型別填 `list`。

由於 list 是一種包含內部型別的型別，你要把內部型別放在方括號中：

@app.get("/response_model_list_of_model-no_annotation", response_model=list[User])
def response_model_list_of_model_no_annotation():
    return [
        DBUser(name="John", surname="Doe", password_hash="secret"),
        DBUser(name="Jane", surname="Does", password_hash="secret2"),
    ]


@app.get("/no_response_model-annotation_list_of_model")
def no_response_model_annotation_list_of_model() -> list[User]:
    return [

      return snapshot().toArray(array);
    }

    private List<Multiset.Entry<E>> snapshot() {
      List<Multiset.Entry<E>> list = newArrayListWithExpectedSize(size());
      // Not Iterables.addAll(list, this), because that'll forward right back here.
      Iterators.addAll(list, iterator());
      return list;
    }
  }

  /**
   * @serialData the ConcurrentMap of elements and their counts.

import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.features.CollectionSize;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.SortedMap;
import org.junit.Ignore;

/**

package org.apache.maven.artifact.resolver.filter;

import java.util.List;

import org.apache.maven.artifact.Artifact;

/**
 * Filter to exclude from a list of artifact patterns.
 *
 * TODO I think this is equiv. to exclusion set filter in maven-core
 */
public class ExcludesArtifactFilter extends IncludesArtifactFilter {
    public ExcludesArtifactFilter(List<String> patterns) {
        super(patterns);
    }

    @Override

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.lang.reflect.Method;
import org.junit.Ignore;

/**
 * Tests {@link java.util.List#hashCode}.
 *
 * @author George van den Driessche
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")

     * @param node the {@link Node} to flatten, must not be {@code null}
     * @param scope an optional {@link PathScope} to filter out dependencies
     * @return the flattened list of node
     * @throws DependencyResolverException
     */
    List<Node> flatten(@Nonnull Session session, @Nonnull Node node, @Nullable PathScope scope)
            throws DependencyResolverException;

    @Nonnull

    return new WrappedCollection(key, collection, null);
  }

  final List<V> wrapList(
      @ParametricNullness K key, List<V> list, @Nullable WrappedCollection ancestor) {
    return (list instanceof RandomAccess)
        ? new RandomAccessWrappedList(key, list, ancestor)
        : new WrappedList(key, list, ancestor);
  }

  /**

import com.google.common.collect.testing.features.CollectionSize;
import java.lang.reflect.Method;
import java.util.List;
import org.junit.Ignore;

/**
 * A generic JUnit test which tests {@code add(Object)} operations on a list. Can't be invoked
 * directly; please see {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible

     */
    // GET /api/admin/webconfig/settings
    // PUT /api/admin/webconfig/settings
    @Execute
    public JsonResponse<ApiResult> settings(final SearchBody body) {
        validateApi(body, messages -> {});
        final WebConfigPager pager = copyBeanToNewBean(body, WebConfigPager.class);
        final List<WebConfig> list = webConfigService.getWebConfigList(pager);