title: Creating a list merging the elements of a previous list and the values of a specific column of a data frame
body: <p>I want to create a new list merging the elements of a previous list plus the values of a specific column of one data frame. See the example below.</p>
  <p>The list I already have:</p>
  <pre><code>variables = ['Price_x_x', 'Mkt Cap_x', '24h Volume_x','Contributors_x', 'Commits in Last 4 Weeks_x','Reddit Subscribers_x', 'FB Likes_x','Market Cap Dominance']
  </code></pre>
  <p>The column:</p>
  <pre><code>0        BTC
  1        ETH
  2        BNB
  3       USDT
  4        DOT
         ...  
  995      CPC
  996      BLK
  997    ROUTE
  998      CNN
  999     BULL
  Name: COIN, Length: 1000, dtype: object
  </code></pre>
  <p>The desired output:</p>
  <pre><code>['BTC_Price_x_x', 'BTC_Mkt Cap_x','BTC_24h Volume_x',...,'BULL_FB Likes_x','BULL_Market Cap Dominance']
  
  </code></pre>