bcrypt - 安装 passlib [bcrypt] 时无法安装 6-1.16.0

Question

我正在使用 pip 安装 passlib[bcrypt]，它给了我以下错误消息。

pip3 install passlib[bcrypt]      

错误信息

Collecting six>=1.4.1
  Downloading six-1.16.0-py2.py3-none-any.whl (11 kB)
ERROR: Could not find a version that satisfies the requirement cffi>=1.1 (from bcrypt>=3.1.0; extra == "bcrypt"->passlib[bcrypt]->-r requirements.txt (line 11)) (from versions: none)
ERROR: No matching distribution found for cffi>=1.1 (from bcrypt>=3.1.0; extra == "bcrypt"->passlib[bcrypt]->-r requirements.txt (line 11))
(env) sumanshu@sumanshu-Lenovo-G50-80:~/Desktop/Fa