windws7环境python2.7离线安装futures

最先参考https://www.cnblogs.com/beiluowuzheng/p/9085004.html

查找了好久的包concurrent居然没找到

参考https://www.cnblogs.com/kylinfish/articles/4352709.html

百度futures-2.1.6.tar.gz找到下载地址https://pypi.org/project/futures/2.1.6/#files

安装：easy_install futures-2.1.6.tar.gz

确认：from concurrent import futures