Weird repeated sequence printed to console when installing packages through conda

问题

My system specs:

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

Recently when after installing or updating packages through conda and sometimes even pip the following sequence is printed to the console:

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

I couldn't tell you how many times this is repeated I'm running console2 and the the command history gets cut off after my 300 lines. I could print the whole thing to a text file if needed but I thought I'd ask first. Does anybody know what this is or how to fix it?

回答1:

According to this post, you may upgrade to Cryptography 1.7 with pip:

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

来源：https://stackoverflow.com/questions/41898928/weird-repeated-sequence-printed-to-console-when-installing-packages-through-cond