解决方法:
1.切换到C:\Program Files\Python37\Scripts
2.执行python pip.exe install SomePackage进行安装
3.安装成功后执行pip仍报错
4.查看安装成功后,提示pip要升级
5.执行python -m pip install --upgrade pip //(如果更新慢,换这个)python -m pip install --upgrade pip -i https://pypi.douban.com/simple
6.升级成功后,再次执行pip,OK了