python ,两个版本，用pip安装第三方库

 总结：python3 -m pip install -i http://pypi.douban.com/simple --trusted-host pypi.douban.com 模块名

 来源:https://blog.csdn.net/qq_29784441/article/details/80661749?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~baidu_landing_v2~default-1-80661749.nonecase&utm_term=python%E6%9C%89%E4%B8%A4%E4%B8%AA%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E6%97%B6%E6%80%8E%E4%B9%88%E5%A4%84%E7%90%86