错误:无法为使用 PEP 517 且无法直接安装的密码学

ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly(错误:无法为使用 PEP 517 且无法直接安装的密码学构建轮子)

问题描述

当 pip 为加密包构建轮子时出现错误.

I get an error when pip builds wheels for the cryptography package.

错误:

LINK : fatal error LNK1181: cannot open input file 'libssl.lib'
  error: command 'C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Tools\MSVC\14.16.27023\bin\HostX86\x86\link.exe' failed with exit status 1181
  ----------------------------------------
  ERROR: Failed building wheel for cryptography
  Running setup.py clean for cryptography
Failed to build cryptography
ERROR: Could not build wheels for cryptography which use PEP 517 and cannot be installed directly

我已经安装了 OpenSSL 并按照这篇文章中的建议设置了环境变量，但问题仍然存在.我的设置详情:

I have already installed OpenSSL and set the environment variables as suggested in this post yet the problem persists. My setup details:

• 系统 - Windows 10
• Python - 3.8
• 点 - 19.3.1

推荐答案

在 requirements.txt 中将加密设置为 2.8 版解决了这个问题.

Setting cryptography to version 2.8 in requirements.txt fixed the issue.

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