exists, err := c.entryExists(ctx, index, key)
	if err == nil && exists {
		res, err := c.Delete(
			index,
			key,
			c.Delete.WithContext(ctx),
		)
		if err != nil {
			return err
		}
		defer xhttp.DrainBody(res.Body)
		if res.IsError() {
			return fmt.Errorf("Delete err: %s", res.String())
		}
		return nil
	}
	return err
}

# PyInstaller
#  Usually these files are written by a python script from a template
#  before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec

# Installer logs
pip-log.txt
pip-delete-this-directory.txt

# Unit test / coverage reports
htmlcov/
.tox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
.hypothesis/
.pytest_cache/

# Translations
*.mo

    @Override
    protected String doBuildColumnString(String dm) {
        StringBuilder sb = new StringBuilder();
        sb.append(dm).append(name);
        if (sb.length() > dm.length()) {
            sb.delete(0, dm.length());
        }
        sb.insert(0, "{").append("}");
        return sb.toString();
    }

    // ===================================================================================

这里的「操作」指的是一种 HTTP「方法」。

下列之一：

* `POST`
* `GET`
* `PUT`
* `DELETE`

...以及更少见的几种：

* `OPTIONS`
* `HEAD`
* `PATCH`
* `TRACE`

在 HTTP 协议中，你可以使用以上的其中一种（或多种）「方法」与每个路径进行通信。

---

在开发 API 时，你通常使用特定的 HTTP 方法去执行特定的行为。

通常使用：

* `POST`：创建数据。
* `GET`：读取数据。
* `PUT`：更新数据。
* `DELETE`：删除数据。

因此，在 OpenAPI 中，每一个 HTTP 方法都被称为「操作」。

我们也打算称呼它们为「操作」。

	CheckUser(t, user2, user)

	DB.Delete(&pet)

	var user3 User
	DB.Preload(clause.Associations+"."+clause.Associations).Find(&user3, "id = ?", user.ID)
	if len(user3.Pets) != 0 {
		t.Fatalf("User.Pet[0] was deleted and should not exist.")
	}

	var user4 *User
	DB.Preload("Pets.Toy").Find(&user4, "id = ?", user.ID)
	if len(user4.Pets) != 0 {
		t.Fatalf("User.Pet[0] was deleted and should not exist.")
	}

                                    </button>
                                    <c:if test="${!running and !systemJobId}">
                                        <button type="button" class="btn btn-danger" name="delete"
                                                data-toggle="modal" data-target="#confirmToDelete"
                                                value="<la:message key="labels.crud_button_delete" />">

    @Secured({ ROLE })
    public HtmlResponse delete(final EditForm form) {
        verifyCrudMode(form.crudMode, CrudMode.DETAILS);
        validate(form, messages -> {}, this::asDetailsHtml);
        verifyToken(this::asDetailsHtml);
        final String id = form.id;
        pathMappingService.getPathMapping(id).ifPresent(entity -> {
            try {
                pathMappingService.delete(entity);

        } finally {
            try {
                processHelper.destroyProcess(sessionId);
            } finally {
                if (propFile != null && !propFile.delete()) {
                    logger.warn("Failed to delete {}.", propFile.getAbsolutePath());
                }
                deleteTempDir(ownTmpDir);
            }
        }
    }

    @Override

        } finally {
            try {
                processHelper.destroyProcess(sessionId);
            } finally {
                if (propFile != null && !propFile.delete()) {
                    logger.warn("Failed to delete {}.", propFile.getAbsolutePath());
                }
                deleteTempDir(ownTmpDir);
            }
        }
    }

    @Override

        if (warnAboutCleanup) {
            System.out.println("[WARNING] TestFileManager from: " + callerInfo.getClassName() + " not cleaned up!");
        }
    }

    public void markForDeletion(File toDelete) {
        filesToDelete.add(toDelete);
        warnAboutCleanup = true;
    }

    public synchronized File createTempDir() {
        try {
            Thread.sleep(20);
        } catch (InterruptedException e) {