仅安装pep 518构建系统要求(以生成sdist)

Question

佩普518介绍了pyproject.toml文件，以及描述构建所需工具的一节：

[build-system]
requires = ["setuptools", "wheel", "numpy>=1.13"]

在这里，我告诉构建系统(隐式setuptools)，在运行构建之前，我需要安装这三个需求。(是的，我确实需要numpy作为构建过程的一部分。)

当我运行pip wheel时，它知道如何在这个文件中查找这个部分，安装需求，然后构建轮子。但是pip无法创建sdist发行版(以及它的维护人员似乎不情愿添加一个发行版)，所以我需要运行python setup.py sdist。这就是问题所在: setup.py不知道它需要numpy，而构建失败了。

是否有一种标准的方法只需安装需求，然后构建一个sdist？特别是，pip已经转向构建隔离，所以这可以用隔离来完成吗？如果做不到这一点，我可以创建自己的环境来隔离；那么，在某些环境中安装需求的最佳方法是什么？

Answer 1

一种方法是使用pypa项目pep517 (尽管模块被标记为“实验性”)

下面是我尝试过的具有特殊依赖关系的示例dist：

# setup.py
from setuptools import setup
import astpretty
setup(name='wat', version='1')

# pyproject.toml
[build-system]
requires = ["setuptools", "wheel", "astpretty"]
build-backend = "setuptools.build_meta"

$ python -m pep517.build --source .
WARNING: You are using pip version 20.2.1; however, version 20.2.2 is available.
You should consider upgrading via the '/tmp/x/venv/bin/python -m pip install --upgrade pip' command.
running egg_info
creating wat.egg-info
writing wat.egg-info/PKG-INFO
writing dependency_links to wat.egg-info/dependency_links.txt
writing top-level names to wat.egg-info/top_level.txt
writing manifest file 'wat.egg-info/SOURCES.txt'
reading manifest file 'wat.egg-info/SOURCES.txt'
writing manifest file 'wat.egg-info/SOURCES.txt'
running sdist
running egg_info
writing wat.egg-info/PKG-INFO
writing dependency_links to wat.egg-info/dependency_links.txt
writing top-level names to wat.egg-info/top_level.txt
reading manifest file 'wat.egg-info/SOURCES.txt'
writing manifest file 'wat.egg-info/SOURCES.txt'
warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md

running check
warning: check: missing required meta-data: url

warning: check: missing meta-data: either (author and author_email) or (maintainer and maintainer_email) must be supplied

creating wat-1
creating wat-1/wat.egg-info
copying files to wat-1...
copying pyproject.toml -> wat-1
copying setup.py -> wat-1
copying wat.egg-info/PKG-INFO -> wat-1/wat.egg-info
copying wat.egg-info/SOURCES.txt -> wat-1/wat.egg-info
copying wat.egg-info/dependency_links.txt -> wat-1/wat.egg-info
copying wat.egg-info/top_level.txt -> wat-1/wat.egg-info
Writing wat-1/setup.cfg
Creating tar archive
removing 'wat-1' (and everything under it)
$ ls dist/
wat-1.tar.gz