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pychram 安装 pycrypto遇到如下问题：
pycrypto install command ‘C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.exe’ failed with exit status 2
1、open “x86_x64 Cross-Tools Command Prompt for VS 2017” with administrator privilege in start menu.
2、set CL=-FI"%VCINSTALLDIR%Tools\MSVC\14.11.25503\include\stdint.h"
3、pip install pycrypto