if (head == null) { // empty list
      head = tail = node;
      keyToKeyList.put(key, new KeyList<K, V>(node));
      modCount++;
    } else if (nextSibling == null) { // non-empty list, add to tail
      // requireNonNull is safe because the list is non-empty.
      requireNonNull(tail).next = node;
      node.previous = tail;
      tail = node;
      KeyList<K, V> keyList = keyToKeyList.get(key);

          e,
          equalObject1
              + " [group 1, item 1] must be Object#equals to "
              + notEqualObject1
              + " [group 1, item 2]");
      return;
    }
    fail("Should get not equal to equal object error");
  }

  /**
   * Test EqualsTester with no equals or not equals objects. This checks proper handling of null,
   * incompatible class and reflexive tests
   */

final, o principal objetivo é ser capaz de **atender seus clientes de API** de uma forma **segura**, **evitar interrupções** e usar os **recursos de computação** (por exemplo, servidores remotos/máquinas virtuais) da forma mais eficiente possível. 🚀

Vou lhe contar um pouco mais sobre esses **conceitos** aqui, e espero que isso lhe dê a **intuição** necessária para decidir como implantar sua API em ambientes muito diferentes, possivelmente até mesmo em **futuros** ambientes que ainda não existem....

我们甚至可以声明[全局依赖项](dependencies/global-dependencies.md)，它会和每个 `APIRouter` 的依赖项组合在一起：

{* ../../docs_src/bigger_applications/app_an_py310/main.py hl[1,3,7] title["app/main.py"] *}

### 导入 `APIRouter` { #import-the-apirouter }

现在，我们导入具有 `APIRouter` 的其他子模块：

{* ../../docs_src/bigger_applications/app_an_py310/main.py hl[4:5] title["app/main.py"] *}

由于文件 `app/routers/users.py` 和 `app/routers/items.py` 是同一 Python 包 `app` 一个部分的子模块，因此我们可以使用单个点 ` .` 通过「相对导入」来导入它们。

		t.Fatal(err)
	}
	// Failure case where we detected successfully cross device mounts.
	{
		absPaths := []string{"/path/to/1"}
		if err = checkCrossDevice(absPaths, mountsPath); err == nil {
			t.Fatal("Expected to fail, but found success")
		}

		mp := []mountInfo{
			{"/dev/2", "/path/to/1/2", "type2", []string{"flags"}, "2", "2"},
		}

#### O tempo para responder ajuda os invasores { #the-time-to-answer-helps-the-attackers }

```python
from main import app
```

Якщо ваш код має таку структуру:

```
.
├── backend
│   ├── main.py
│   ├── __init__.py
```

Тоді ви встановили б `entrypoint` як:

```toml
[tool.fastapi]
entrypoint = "backend.main:app"
```

що еквівалентно:

```python
from backend.main import app
```

plugins {
    java
}

val validateTaskName = "validatePlugins"
val reportFileName = "task-properties/report.txt"

tasks.register<ValidatePlugins>(validateTaskName) {
    val main = project.sourceSets.main.get()
    classes.from(main.output)
    classpath.from(main.runtimeClasspath)
    outputFile = project.reporting.baseDirectory.file(reportFileName)
    enableStricterValidation = true

```

</div>

/// note

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.

It is equivalent to:

```Python
from main import app
```

///

RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt

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

# (2)!
CMD ["fastapi", "run", "main.py", "--port", "80"]
```

1. Copy the `main.py` file to the `/code` directory directly (without any `./app` directory).

2. Use `fastapi run` to serve your application in the single file `main.py`.