title: In-place sort_values in pandas what does it exactly mean?
body: <p>Maybe a very naive question, but I am stuck in this: <code>pandas.Series</code> has a method <code>sort_values</code> and there is an option to do it "in place" or not. I have Googled for it a while, but I am not very clear about it. It seems that this thing is assumed to be perfectly known to everybody but me. Could anyone give me some illustrative explanation how these two options differ each other for dummies...?</p>
  
  <p>Thank you for any assistance.</p>