title: How to replace all string in all columns using pandas?
body: <p>In pandas, how do I replace <code>&amp;amp;</code> with '&amp;' from all columns where <code>&amp;amp</code> could be in any position in a string?</p>
  
  <p>For example, in column Title if there is a value 'Good <code>&amp;amp;</code> bad', how do I replace it with 'Good &amp; bad'?</p>