cannot import name 'XXX' from 'pyecharts'

1. pyecharts常用的几个模块都不能导入
   cannot import name ‘Geo’ from ‘pyecharts’
   cannot import name ‘Style’ from ‘pyecharts’
   cannot import name ‘Bar’ from ‘pyecharts’
2. 解决办法，先卸载之前的，然后再下载一个指定版本号的
   卸载pip uninstall pyecharts
   重新下载pip install pyecharts==0.5.11