pip安装cryptography
遇到
ERROR: Could not find a version that satisfies the requirement cryptography (from versions: none)
ERROR: No matching distribution found for cryptography
执行命令
pip install cryptography -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
即可安装成功
pip安装其他包也是如此,只需要将cryptography替换成其他包名即可