关于pip始终安装pandans出现错误.
Collecting pandas
Using cached https://files.pythonhosted.org/packages/08/01/803834bc8a4e708aedebb133095a88a4dad9f45bbaf5ad777d2bea543c7e/pandas-0.22.0.tar.gz
Installing build dependencies ... error
查了半天发现python3.4不兼容pandas0.21+
解决：
pip3 install 'pandas<0.21'