通过 conda 安装软件包时，奇怪的重复序列打印到控制台

Question

我的系统规格：

C:\Users\Lenovo>conda info
Current conda install:

           platform : win-64
      conda version : 4.3.8
   conda is private : False
  conda-env version : 4.3.8
conda-build version : 1.21.3
     python version : 3.5.2.final.0
   requests version : 2.12.4
   root environment : C:\Anaconda3  (writable)
default environment : C:\Anaconda3
   envs directories : C:\Anaconda3\envs
      package cache : C:\Anaconda3\pkgs
       channel URLs : https://repo.continuum.io/pkgs/free/win-64
                      https://repo.continuum.io/pkgs/free/noarch
                      https://repo.continuum.io/pkgs/r/win-64
                      https://repo.continuum.io/pkgs/r/noarch
                      https://repo.continuum.io/pkgs/pro/win-64
                      https://repo.continuum.io/pkgs/pro/noarch
                      https://repo.continuum.io/pkgs/msys2/win-64
                      https://repo.continuum.io/pkgs/msys2/noarch
        config file : None
       offline mode : False
         user-agent : conda/4.3.8 requests/2.12.4 CPython/3.5.2 Windows/7 Windows/6.1.7601

最近在通过 conda 安装或更新包后，有时甚至 pip 时，以下序列被打印到控制台：

extern "Python": function Cryptography_locking_cb() called, but @ffi.def_extern(
) was not called in the current subinterpreter.  Returning 0.
extern "Python": function Cryptography_locking_cb() called, but @ffi.def_extern(
) was not called in the current subinterpreter.  Returning 0.
extern "Python": function Cryptography_locking_cb() called, but @ffi.def_extern(
) was not called in the current subinterpreter.  Returning 0.
extern "Python": function Cryptography_locking_cb() called, but @ffi.def_extern(
) was not called in the current subinterpreter.  Returning 0.
... # keeps repeating

我无法告诉你重复了多少次我正在运行控制台 2，并且命令历史记录在我的 300 行之后被切断。如果需要，我可以将整个内容打印到文本文件中，但我想我会先问。有谁知道这是什么或如何解决它？

Answer 1

根据this post，您可以使用 pip 升级到 Cryptography 1.7：

pip install --upgrade pip
pip install cryptography>=1.7 --upgrade