> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/porters-handbook/di-7-zhang-flavors/7.4.usespython-he-flavors.md).

# 7.4.USES=python 和 Flavors

当使用 [`python`](https://docs.freebsd.org/en/books/porters-handbook/uses/#uses-python) 并设置了 `USE_PYTHON=distutils` 时，Port 会自动填充 `FLAVORS`，其中包含它所支持的 Python 版本。

**示例 7. 简单的 `USES=python`**

假设当前支持的 Python 版本是 2.7、3.4、3.5 和 3.6，且默认的 Python 2 和 Python 3 版本分别是 2.7 和 3.6，那么以下写法：

```makefile
USES=	python
USE_PYTHON=	distutils
```

将获得这些 flavor：`py27` 和 `py36`。

```makefile
USES=	python
USE_PYTHON=	distutils allflavors
```

将获得这些 flavor：`py27`、`py34`、`py35` 和 `py36`。

**示例 8：带版本要求的 `USES=python`**

假设当前支持的 Python 版本是 2.7、3.4、3.5 和 3.6，且默认的 Python 2 和 Python 3 版本分别是 2.7 和 3.6，那么以下写法：

```makefile
USES=	python:-3.5
USE_PYTHON=	distutils
```

将获得这个 flavor：`py27`。

```makefile
USES=	python:-3.5
USE_PYTHON=	distutils allflavors
```

将获得这些 flavor：`py27`、`py34` 和 `py35`。

```makefile
USES=	python:3.4+
USE_PYTHON=	distutils
```

将获得这个 flavor：`py36`。

```makefile
USES=	python:3.4+
USE_PYTHON=	distutils allflavors
```

将获得这些 flavor：`py34`、`py35` 和 `py36`。

可以使用 `PY_FLAVOR` 来依赖正确版本的 Python 模块。所有对支持 flavor 的 Python Port 的依赖都应使用 `PY_FLAVOR`，而不是直接使用 `FLAVOR`。

**示例 9. 适用于未使用 `distutils` 的 Port**

如果默认的 Python 3 版本是 3.6，以下写法将把 `PY_FLAVOR` 设置为 `py36`：

```makefile
RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}mutagen>0:audio/py-mutagen@${PY_FLAVOR}

USES=	python:3.5+
```


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