# Những bước đầu tiên

Tệp tin FastAPI đơn giản nhất có thể trông như này:

{* ../../docs_src/first_steps/tutorial001.py *}

Sao chép sang một tệp tin `main.py`.

Chạy live server:

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>:     Started reloader process [28720]

* Allow conformance tests to run on non-GCE providers ([#26932](https://github.com/kubernetes/kubernetes/pull/26932), [@aaronlevy](https://github.com/aaronlevy))
* AWS kube-up: move to Docker 1.11.2 ([#27676](https://github.com/kubernetes/kubernetes/pull/27676), [@justinsb](https://github.com/justinsb))

    assertThrows(IllegalArgumentException.class, () -> moveHelper(false, asciiFile, asciiFile));
  }

  private void moveHelper(boolean success, File from, File to) throws IOException {
    try {
      Files.move(from, to);
      if (success) {
        assertFalse(from.exists());
        assertTrue(to.exists());
      } else {
        fail("expected exception");
      }
    } catch (IOException possiblyExpected) {

	}

	_, err := disk.DiskInfo(ctx, DiskInfoOptions{})
	if err != nil {
		if errors.Is(err, errDriveIsRoot) {
			// This is a root drive, ignore and move on
			return nil
		}
		if !errors.Is(err, errUnformattedDisk) {
			return err
		}
	}

	// Prevent parallel erasure set healing

</p>

<p>
Not introducing data races also means not assuming that loops terminate.
For example, a compiler must in general not move the accesses to <code>*p</code> or <code>*q</code>
ahead of the loop in this program:
</p>

<pre>
n := 0
for e := list; e != nil; e = e.next {
	n++
}
i := *p
*q = 1
</pre>

<p>

Now, let's see the module at `app/main.py`.

Here's where you import and use the class `FastAPI`.

This will be the main file in your application that ties everything together.

And as most of your logic will now live in its own specific module, the main file will be quite simple.

### Import `FastAPI` { #import-fastapi }

You import and create a `FastAPI` class as normally.

    } else {
      return new Itr<E>(this, index);
    }
  }

  /** A singleton implementation of iterator() for the empty ImmutableList. */
  // TODO(b/345814817): Move this to RegularImmutableList?
  @SuppressWarnings("ClassInitializationDeadlock")
  private static final UnmodifiableListIterator<Object> EMPTY_ITR =
      new Itr<Object>(RegularImmutableList.EMPTY, 0);

        // Fill the receive buffer without holding any locks.
        val read = source.read(receiveBuffer, remainingByteCount)
        if (read == -1L) throw EOFException()
        remainingByteCount -= read

        // Move the received data to the read buffer to the reader can read it. If this source has
        // been closed since this read began we must discard the incoming data and tell the
        // connection we've done so.
        withLock {

* **Intuitivo**: Grande supporto per gli editor di testo con <abbr title="anche conosciuto come auto-completamento, autocompletion, IntelliSense">autocompletamento</abbr> in ogni dove. In questo modo si può dedicare meno tempo al debugging.
* **Facile**: Progettato per essere facile da usare e imparare. Si riduce il tempo da dedicare alla lettura della documentazione.

    assertThrows(IllegalArgumentException.class, () -> moveHelper(false, asciiFile, asciiFile));
  }

  private void moveHelper(boolean success, File from, File to) throws IOException {
    try {
      Files.move(from, to);
      if (success) {
        assertFalse(from.exists());
        assertTrue(to.exists());
      } else {
        fail("expected exception");
      }
    } catch (IOException possiblyExpected) {