背景：

系统window 10

python3.5

在安装pycrypto时，提示错误信息如下：

error: Unable to find vcvarsall.bat

为什么报Unable to find vcvarsall.bat

window安装pycrypto,和解决遇到unable to find vcvarsall.bat 问题

python2.6-python3.3解决：

http://www.voidspace.org.uk/python/modules.shtml#pycrypto

python3.5解决:

    pycrypto编译下载链接：https://download.csdn.net/download/a1007720052/10458303

    github:https://github.com/sfbahr/PyCrypto-Wheels/

python3.6解决

    https://download.csdn.net/download/fzwolfcub/10173046

安装方法：

pip install xx.whl