```Python hl_lines="1  3  7" title="app/main.py"
{!../../../docs_src/bigger_applications/app/main.py!}
```

### 🗄 `APIRouter`

🔜 👥 🗄 🎏 🔁 👈 ✔️ `APIRouter`Ⓜ:

```Python hl_lines="5" title="app/main.py"
{!../../../docs_src/bigger_applications/app/main.py!}
```

maven-deploy-plugin 0.1 maven-plugin Maven Integration Test Plugin A test plugin to assist testing of Maven core. 2009 maven-core-it file:///${basedir}/repo true true org.apache.maven maven-plugin-api 2.0 . pom.xml src/** src/main/resources src/main/java/org/apache/maven/plugins/coreit/ItMojo.java src/main/java/org/apache/maven/plugins/coreit/ItMojo.java package org.apache.maven.plugin.coreit; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE...

```Python
{!../../../docs_src/first_steps/tutorial001.py!}
```

Copy that to a file `main.py`.

Run the live server:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:single">main.py</u>
<font color="#3465A4">INFO    </font> Using path <font color="#3465A4">main.py</font>

# (1)
COPY ./main.py /code/

# (2)
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "80"]
```

1. Скопируйте непосредственно файл `main.py` в директорию `/code` (не указывайте `./app`).

2. При запуске Uvicorn укажите ему, что объект `app` нужно импортировать из файла `main` (вместо импортирования из `app.main`).

<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note
    📋 `uvicorn main:app` 🔗:

    * `main`: 📁 `main.py` (🐍 "🕹").
    * `app`: 🎚 ✍ 🔘 `main.py` ⏮️ ⏸ `app = FastAPI()`.
    * `--reload`: ⚒ 💽 ⏏ ⏮️ 📟 🔀. 🕴 ⚙️ 🛠️.

🔢, 📤 ⏸ ⏮️ 🕳 💖:

```hl_lines="4"

```

</div>

Let's see what each of those options mean:

* `main:app`: This is the same syntax used by Uvicorn, `main` means the Python module named "`main`", so, a file `main.py`. And `app` is the name of the variable that is the **FastAPI** application.
    * You can imagine that `main:app` is equivalent to a Python `import` statement like:

        ```Python
        from main import app
        ```

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.curl

import kotlin.system.exitProcess

fun main(args: Array<String>) {
  Main().main(args)
  exitProcess(0)

            ]
        }
    )


def test_main_depends_q_foo():
    response = client.get("/main-depends/?q=foo")
    assert response.status_code == 200
    assert response.json() == {
        "in": "main-depends",
        "params": {"q": "foo", "skip": 0, "limit": 100},
    }


def test_main_depends_q_foo_skip_100_limit_200():
    response = client.get("/main-depends/?q=foo&skip=100&limit=200")

    {!> ../../../docs_src/settings/app02_an_py39/main.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="6  12-13"
    {!> ../../../docs_src/settings/app02_an/main.py!}
    ```

=== "Python 3.8+ 非注解版本"

    !!! tip
        如果可能，请尽量使用 `Annotated` 版本。

    ```Python hl_lines="5  11-12"
    {!> ../../../docs_src/settings/app02/main.py!}
    ```

!!! tip
    我们稍后会讨论 `@lru_cache`。

```

</div>

➡️ 👀 ⚫️❔ 🔠 👈 🎛 ⛓:

* `main:app`: 👉 🎏 ❕ ⚙️ Uvicorn, `main` ⛓ 🐍 🕹 📛 "`main`",, 📁 `main.py`. &amp; `app` 📛 🔢 👈 **FastAPI** 🈸.
    * 👆 💪 🌈 👈 `main:app` 🌓 🐍 `import` 📄 💖:

        ```Python
        from main import app
        ```

    * , ❤ `main:app` 🔜 🌓 🐍 `import` 🍕 `from main import app`.
* `--workers`: 🔢 👨‍🏭 🛠️ ⚙️, 🔠 🔜 🏃 Uvicorn 👨‍🏭, 👉 💼, 4️⃣ 👨‍🏭.