try:
    from fastapi_cli.cli import main as cli_main

except ImportError:  # pragma: no cover
    cli_main = None  # type: ignore


def main() -> None:
    if not cli_main:  # type: ignore[truthy-function]
        message = 'To use the fastapi command, please install "fastapi[standard]":\n\n\tpip install "fastapi[standard]"\n'
        print(message)
        raise RuntimeError(message)  # noqa: B904

    )
    assert result.returncode == 1, result.stdout
    assert "Using path non_existent_file.py" in result.stdout


def test_fastapi_cli_not_installed():
    with patch.object(fastapi.cli, "cli_main", None):
        with pytest.raises(RuntimeError) as exc_info:
            fastapi.cli.main()

    "uvicorn[standard] >=0.12.0",
    # Settings management
    "pydantic-settings >=2.0.0",
    # Extra Pydantic data types
    "pydantic-extra-types >=2.0.0",
]

[project.scripts]
fastapi = "fastapi.cli:main"

[tool.pdm]
version = { source = "file", path = "fastapi/__init__.py" }
distribution = true

[tool.pdm.build]
source-includes = [
    "tests/",
    "docs_src/",
    "requirements*.txt",

//// tab | 🐍 3️⃣.6️⃣ & 🔛

```Python hl_lines="14-22"
{!> ../../docs_src/sql_databases/sql_app/alt_main.py!}
```

////

//// tab | 🐍 3️⃣.9️⃣ & 🔛

```Python hl_lines="12-20"
{!> ../../docs_src/sql_databases/sql_app_py39/alt_main.py!}
```

////

/// info

👥 🚮 🏗 `SessionLocal()` & 🚚 📨 `try` 🍫.

 & ⤴️ 👥 🔐 ⚫️ `finally` 🍫.

//// tab | Python 3.9+

```Python hl_lines="12-20"
{!> ../../docs_src/sql_databases/sql_app_py39/alt_main.py!}
```

////

//// tab | Python 3.8+

```Python hl_lines="14-22"
{!> ../../docs_src/sql_databases/sql_app/alt_main.py!}
```

////

/// info

我们将`SessionLocal()`请求的创建和处理放在一个`try`块中。

然后我们在finally块中关闭它。