title: Pandas read_excel keep A:Z column names
body: <p>When importing an excel file to pandas using read_excel, I would like to keep the column and row names of excel.
  I.e., I would like my columns to be named 'A','B',...'Z','AA','AB' etc. and rows from 1 and on.</p>
  
  <p>Is there a good way to do this?</p>