title: how to split 'number' to separate columns in pandas DataFrame
body: <p>I have a dataframe;</p>
  
  <pre><code>df=pd.DataFrame({'col1':[100000,100001,100002,100003,100004]})
  
       col1    
  0   100000    
  1   100001
  2   100002
  3   100003
  4   100004
  </code></pre>
  
  <p>I wish I could get the result below;</p>
  
  <pre><code>    col1   col2    col3
  0   10     00       00 
  1   10     00       01
  2   10     00       02
  3   10     00       03
  4   10     00       04
  </code></pre>
  
  <p>each rows show the splitted number. I guess the number should be converted to string, but I have no idea next step....
  I wanna ask how to split number to separate columns.</p>