* find the module `dependencies` (an imaginary file at `app/routers/dependencies.py`)...
* and from it, import the function `get_token_header`.

But that file doesn't exist, our dependencies are in a file at `app/dependencies.py`.

Remember how our app/file structure looks like:

<img src="/img/tutorial/bigger-applications/package.drawio.svg">

---

The two dots `..`, like in:

# 使用yield的依赖项

FastAPI支持在完成后执行一些<abbr title='有时也被称为"退出"("exit")，"清理"("cleanup")，"拆卸"("teardown")，"关闭"("close")，"上下文管理器"("context managers")。 ...'>额外步骤</abbr>的依赖项.

为此，你需要使用 `yield` 而不是 `return`，然后再编写这些额外的步骤（代码）。

/// tip | 提示

确保在每个依赖中只使用一次 `yield`。

///

/// note | 技术细节

任何一个可以与以下内容一起使用的函数：

        @Override
        public boolean isExistClass(final String className) {
            final File file = new File(baseDir, toClassFile(ClassUtil.concatName(rootPackage, className)));
            return file.exists();
        }

        @Override
        public void forEach(final ClassHandler handler) {
            ClassTraversalUtil.forEach(baseDir, rootPackage, handler);
        }

        @Override

///

## Salida temprana y `scope` { #early-exit-and-scope }

Normalmente, el código de salida de las dependencias con `yield` se ejecuta **después de que el response** se envía al cliente.

- Fix detach azure disk issue when vm not exist ([#95177](https://github.com/kubernetes/kubernetes/pull/95177), [@andyzhangx](https://github.com/andyzhangx)) [SIG Cloud Provider]

// Run runs the given function, passing it a stopper channel. If the deadline passes before
// the function finishes executing, Run returns context.DeadlineExceeded to the caller.
// channel so that the work function can attempt to exit gracefully.
// Multiple calls to Run will run independently of each other.
func (d *DeadlineWorker) Run(work func() error) error {

  - A namespaced object with an ownerReference referencing a uid of a namespaced kind which does not exist in the same namespace is now consistently treated as though that owner does not exist, and the child object is deleted.

      multimap.put(elements[i], i);
    }
  }

  /**
   * Implements {@code Multimap.put()} -- and no other methods -- for a {@code Map} by ignoring all
   * but the latest value for each key. This class exists only so that we can use {@link
   * MultimapsCollectionTest#populateMultimapForGet(Multimap, String[])} and similar methods to
   * populate a map to be passed to {@link Multimaps#forMap(Map)}. All tests should run against the

	return !r.isFull && r.w == r.r
}

// CloseWithError closes the writer; reads will return
// no bytes and the error err, or EOF if err is nil.
//
// CloseWithError never overwrites the previous error if it exists
// and always returns nil.
func (r *RingBuffer) CloseWithError(err error) {
	if err == nil {
		err = io.EOF
	}
	r.setErr(err, false)
}

// CloseWriter closes the writer.

    /**
     * Imports crawling information and parameters from a CSV file.
     * The CSV format expected is: SessionId, SessionCreatedTime, Key, Value, CreatedTime.
     * Creates new crawling sessions if they don't exist and adds parameters to them.
     *
     * @param reader the Reader containing CSV data to import
     */
    public void importCsv(final Reader reader) {
        @SuppressWarnings("resource")