////

이 정보는 [가상 환경](virtual-environments.md){.internal-link target=\_blank} 에 대해 알아볼 때 유용할 것입니다.

## 결론

이 문서를 읽고 **환경 변수**가 무엇이고 파이썬에서 어떻게 사용하는지 기본적으로 이해하셨을 겁니다.

또한 <a href="https://ko.wikipedia.org/wiki/환경_변수" class="external-link" target="_blank">환경 변수에 대한 위키피디아(한국어)</a>에서 이에 대해 자세히 알아볼 수 있습니다.

많은 경우에서, 환경 변수가 어떻게 유용하고 적용 가능한지 바로 명확하게 알 수는 없습니다. 하지만 개발할 때 다양한 시나리오에서 계속 나타나므로 이에 대해 아는 것이 좋습니다.

    if (result.equals("/..")) {
      result = "/";
    } else if (result.isEmpty()) {
      result = ".";
    }

    return result;
  }

  /**
   * Returns the <a href="http://en.wikipedia.org/wiki/Filename_extension">file extension</a> for
   * the given file name, or the empty string if the file has no extension. The result does not
   * include the '{@code .}'.
   *

import org.jspecify.annotations.Nullable;

/**
 * Provides static methods that involve a {@code Table}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/CollectionUtilitiesExplained#tables">{@code Tables}</a>.
 *
 * @author Jared Levy
 * @author Louis Wasserman
 * @since 7.0
 */
@GwtCompatible
public final class Tables {
  private Tables() {}

  /**

- <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - 需要使用 `SessionMiddleware` 支援時安裝。
- <a href="https://pyyaml.org/wiki/PyYAMLDocumentation" target="_blank"><code>pyyaml</code></a> - 用於支援 Starlette 的 `SchemaGenerator` (如果你使用 FastAPI，可能不需要它)。

用於 FastAPI / Starlette：

* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Obligatoire pour la prise en charge de `SessionMiddleware`.
* <a href="https://pyyaml.org/wiki/PyYAMLDocumentation" target="_blank"><code>pyyaml</code></a> - Obligatoire pour le support `SchemaGenerator` de Starlette (vous n'en avez probablement pas besoin avec FastAPI).

Utilisées par FastAPI / Starlette :

 * before the {@link Service} reaches the {@linkplain State#RUNNING RUNNING} state. The set of legal
 * transitions form a <a href="http://en.wikipedia.org/wiki/Directed_acyclic_graph">DAG</a>,
 * therefore every method of the listener will be called at most once. N.B. The {@link State#FAILED}
 * and {@link State#TERMINATED} states are terminal states, once a service enters either of these

 * an equivalence as a bi-predicate like this: {@code myEquivalence::equivalent}.
 *
 * @author Bob Lee
 * @author Ben Yu
 * @author Gregory Kick
 * @since 10.0 (<a href="https://github.com/google/guava/wiki/Compatibility">mostly
 *     source-compatible</a> since 4.0)
 */
@GwtCompatible
/*
 * The type parameter is <T> rather than <T extends @Nullable> so that we can use T in the

/**
 * A {@link List} whose contents will never change, with many other important properties detailed at
 * {@link ImmutableCollection}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/ImmutableCollectionsExplained">immutable collections</a>.
 *
 * @see ImmutableMap
 * @see ImmutableSet
 * @author Kevin Bourrillion
 * @since 2.0
 */
@GwtCompatible

* <a href="https://pythonhosted.org/itsdangerous/" target="_blank"><code>itsdangerous</code></a> - Bắt buộc để hỗ trợ `SessionMiddleware`.
* <a href="https://pyyaml.org/wiki/PyYAMLDocumentation" target="_blank"><code>pyyaml</code></a> - Bắt buộc để hỗ trợ `SchemaGenerator` cho Starlette (bạn có thể không cần nó trong FastAPI).

Sử dụng bởi FastAPI / Starlette:

/**
 * A navigable map which forwards all its method calls to another navigable map. Subclasses should
 * override one or more methods to modify the behavior of the backing map as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingNavigableMap} forward <i>indiscriminately</i>