title: I am trying to convert some columns in a DataFrame from float to integers
body: <p>I am using .astype but all I cant find in documentation is converting the whole df not just a few columns.  Any advise? </p>
  
  <p>Date: 2019-05-13             volume: 3.464018e+08     volatility: 3.507323e+09</p>
  
  <p>When I try to do np computations on these numbers I get an error saying number is finite not infinite.  So I am thinking may be it doesn't recognize e+0 in the end which would change if converted to ints. </p>
  
  <p>Thanks in advance!</p>