在 setup.cfg 中正确使用 PEP 508 环境标记 [英] Correct use of PEP 508 environment markers in setup.cfg

问题描述

我正在尝试使用 PEP 496 -- 环境标记和 PEP 508 -- Python 软件包的依赖规范在特定操作系统上有意义.

I am trying to make use of PEP 496 -- Environment Markers and PEP 508 -- Dependency specification for Python Software Packages by specifying dependencies that only make sense on specific OS.

我的 setup.py 看起来像这样:

My setup.py looks like this:

import setuptools
assert setuptools.__version__ >= '36.0'

setuptools.setup()

我的最小 setup.cfg 看起来像这样:

My minimal setup.cfg looks like this:

[metadata]
name = foobar
version = 1.6.5+0.1.0

[options]
packages = find:

install_requires =
    ham >= 0.1.0
    eggs >= 8.1.2
    spam >= 1.2.3; platform_system=="Darwin"
    i-love-spam >= 1.2.0; platform_system="Darwin"

然而，当尝试使用 pip install -e foobar/ 安装这样的包时，它失败了:

However, when trying to install such a package with pip install -e foobar/, it fails with:

pip._vendor.pkg_resources.RequirementParseError: Invalid requirement, parse error at "'; platfo'"

我猜它不希望有分号.但是我应该如何使用环境标记呢?

I guess it does not expect semicolon there. But how am I supposed to use environment markers then?

推荐答案

一个字符.这就是你所缺少的.您使用的是 platform_system="Darwin" 而不是 platform_system=="Darwin"(install_requires 的最后一行).这样就可以正常工作:

One character. That's all you were missing. You had platform_system="Darwin" instead of platform_system=="Darwin" (the very last line of your install_requires). It works fine this way:

[metadata]
name = foobar
version = 1.6.5+0.1.0

[options]
packages = find:

install_requires =
    ham >= 0.1.0
    eggs >= 8.1.2
    spam >= 1.2.3; platform_system=="Darwin"
    i-love-spam >= 1.2.0; platform_system=="Darwin"

这不是必需的，但您的 setup.py 也可以简化.

It's not necessary but your setup.py could be simplified too.

import setuptools

setup(setup_requires=['setuptools>=36.0'])

与之前的评论不同，我喜欢使用 setup.cfg.它干净而简单.如果你想在运行时使用 setup.cfg 中的信息，很容易解析:

Unlike those commenting before, I like using setup.cfg. It's clean and easy. If you want to use the information from setup.cfg at runtime, it's easy to parse:

from setuptools.config import read_configuration

conf_dict = read_configuration('/home/user/dev/package/setup.cfg')

更多 setup.cfg 信息

这篇关于在 setup.cfg 中正确使用 PEP 508 环境标记的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！