title: Comparing two unidentical data frames and changing the column value
body: <p>I have two data frames</p>
  <pre><code>df1 = {'Product1': ['Computer','Phone','Printer'],
         'Price1':   [1200,800,200]
         }
  
  
  df2= {'Product2': ['Computer','Phone','Desk','chair'],
        'Price2': [900,800,350,40]
        }
  </code></pre>
  <p>I want to compare the two data frames and if there is a match in the Product then concatenate the price along with the product name else keep the product name as in df1.</p>
  <p>so the new</p>
  <pre><code>df1= {'Product1': ['Computer-1200','Phone-800','Printer'],
        'Price1': [1200,800,200]
        }
  </code></pre>