"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。