《绿箭侠》以一种有趣的方式处理它。

现在(2e5031b起)

在箭头/ __init__ . py:

__version__ = 'x.y.z'

在setup . py:

from arrow import __version__

setup(
    name='arrow',
    version=__version__,
    # [...]
)

之前

在箭头/ __init__ . py:

__version__ = 'x.y.z'
VERSION = __version__

在setup . py:

def grep(attrname):
    pattern = r"{0}\W*=\W*'([^']+)'".format(attrname)
    strval, = re.findall(pattern, file_text)
    return strval

file_text = read(fpath('arrow/__init__.py'))

setup(
    name='arrow',
    version=grep('__version__'),
    # [...]
)

无论如何，如果你使用NumPy distutils, NumPy .distutils.misc_util。Configuration有一个make_svn_version_py()方法，它将版本号嵌入到包中。变量version中的__svn_version__。

与其他一些答案相比，还有一个稍微简单一点的选择:

__version_info__ = ('1', '2', '3')
__version__ = '.'.join(__version_info__)

(使用str()将版本号的自动递增部分转换为字符串相当简单。)

Of course, from what I've seen, people tend to use something like the previously-mentioned version when using __version_info__, and as such store it as a tuple of ints; however, I don't quite see the point in doing so, as I doubt there are situations where you would perform mathematical operations such as addition and subtraction on portions of version numbers for any purpose besides curiosity or auto-incrementation (and even then, int() and str() can be used fairly easily). (On the other hand, there is the possibility of someone else's code expecting a numerical tuple rather than a string tuple and thus failing.)

当然，这是我自己的观点，我很乐意听取其他人对使用数字元组的意见。

正如shezi提醒我的那样，(词汇)数字串的比较并不一定与直接的数字比较有相同的结果;需要前导零来提供这一点。因此，最后，将__version_info__(或任何它将被称为)存储为整数值的元组将允许更有效的版本比较。

如果您使用CVS(或RCS)并想要快速解决方案，您可以使用:

__version__ = "$Revision: 1.1 $"[11:-2]
__version_info__ = tuple([int(s) for s in __version__.split(".")])

(当然，修订号会被CVS代替)

这为您提供了一个打印友好的版本和版本信息，您可以使用它来检查您正在导入的模块至少具有预期的版本:

import my_module
assert my_module.__version_info__ >= (1, 1)

使用setuptools和pbr

没有管理版本的标准方法，但是管理包的标准方法是setuptools。

总的来说，我发现最好的版本管理解决方案是使用setuptools和pbr扩展。这是我现在管理版本的标准方式。

对于简单的项目来说，为完整的打包设置项目可能有些过分，但是如果您需要管理版本，那么您可能处于设置所有内容的正确级别。这样做还可以使您的包在PyPi上发布，以便每个人都可以下载并与Pip一起使用它。

PBR moves most metadata out of the setup.py tools and into a setup.cfg file that is then used as a source for most metadata, which can include version. This allows the metadata to be packaged into an executable using something like pyinstaller if needed (if so, you will probably need this info), and separates the metadata from the other package management/setup scripts. You can directly update the version string in setup.cfg manually, and it will be pulled into the *.egg-info folder when building your package releases. Your scripts can then access the version from the metadata using various methods (these processes are outlined in sections below).

当在VCS/SCM中使用Git时，这种设置甚至更好，因为它将从Git中引入大量元数据，这样你的回购就可以成为一些元数据的主要真实来源，包括版本、作者、更改日志等。对于version，它将基于repo中的git标记为当前提交创建一个版本字符串。

PyPA -用SetupTools打包Python包-教程 PBR最新的构建使用文档-如何用元数据设置一个8行的setup.py和setup.cfg文件。

由于PBR会直接从你的git repo中提取版本、作者、更新日志和其他信息，所以setup.cfg中的一些元数据可以被省略，并在为你的包创建发行版时自动生成(使用setup.py)。

实时获取当前版本

Setuptools将使用setup.py实时提取最新信息:

python setup.py --version

这将从setup.cfg文件或git repo中提取最新版本，基于最近的提交和repo中存在的标记。但是，该命令不会更新发行版中的版本。

更新版本元数据

当你使用setup.py(例如py setup.py sdist)创建发行版时，所有当前信息都会被提取并存储在发行版中。这实际上是运行setup.py——version命令，然后将版本信息存储到包中。Egg-info文件夹中的一组文件，用于存储分发元数据。

Note on process to update version meta-data: If you are not using pbr to pull version data from git, then just update your setup.cfg directly with new version info (easy enough, but make sure this is a standard part of your release process). If you are using git, and you don't need to create a source or binary distribution (using python setup.py sdist or one of the python setup.py bdist_xxx commands) the simplest way to update the git repo info into your <mypackage>.egg-info metadata folder is to just run the python setup.py install command. This will run all the PBR functions related to pulling metadata from the git repo and update your local .egg-info folder, install script executables for any entry-points you have defined, and other functions you can see from the output when you run this command. Note that the .egg-info folder is generally excluded from being stored in the git repo itself in standard Python .gitignore files (such as from Gitignore.IO), as it can be generated from your source. If it is excluded, make sure you have a standard "release process" to get the metadata updated locally before release, and any package you upload to PyPi.org or otherwise distribute must include this data to have the correct version. If you want the Git repo to contain this info, you can exclude specific files from being ignored (i.e. add !*.egg-info/PKG_INFO to .gitignore)

从脚本访问版本

您可以在包本身的Python脚本中从当前构建中访问元数据。以版本为例，到目前为止，我发现有几种方法可以做到这一点:

## This one is a new built-in as of Python 3.8.0 should become the standard
from importlib.metadata import version

v0 = version("mypackage")
print('v0 {}'.format(v0))

## I don't like this one because the version method is hidden
import pkg_resources  # part of setuptools

v1 = pkg_resources.require("mypackage")[0].version
print('v1 {}'.format(v1))

# Probably best for pre v3.8.0 - the output without .version is just a longer string with
# both the package name, a space, and the version string
import pkg_resources  # part of setuptools

v2 = pkg_resources.get_distribution('mypackage').version
print('v2 {}'.format(v2))

## This one seems to be slower, and with pyinstaller makes the exe a lot bigger
from pbr.version import VersionInfo

v3 = VersionInfo('mypackage').release_string()
print('v3 {}'.format(v3))

你可以把其中一个直接放在__init__.py中，让包提取版本信息，如下所示，类似于其他一些答案:

__all__ = (
    '__version__',
    'my_package_name'
)

import pkg_resources  # part of setuptools

__version__ = pkg_resources.get_distribution("mypackage").version

在与__init__.py相同的文件夹中创建一个名为_version.txt的文件，并将version写成一行:

0.8.2

从__init__.py中的_version.txt文件中读取以下信息:

    import os 
    def get_version():
        with open(os.path.join(os.path.abspath(os.path.dirname(__file__)), "_version.txt")) as f:
            return f.read().strip() 
    __version__ = get_version()