pip install报错Can't roll back cryptography; was not uninstalled

当使用pip install或者pip install –upgrade报错

Can’t roll back cryptography; was not uninstalled

可以进行以下的尝试:

sudo apt-get install libssl-dev libffi-dev

之后再继续pip install

    原文作者:pcat
    原文地址: https://www.cnblogs.com/pcat/p/6817929.html
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