title: Pandas - find specific value in entire dataframe
body: <p>I have a dataframe and I want to search all columns for values that is text 'Apple'. I know how to do it with one column, but how can I apply this to ALL columns? I want to make it a function, so that next time I can directly use it to search for other values in other dateframes.</p>
  
  <p>Thanks.</p>