title: Data-frame Object has no Attribute
body: <p>I know that this kind of question was asked before and I've checked all the answers and I have tried several times to find a solution but in vain. 
  In fact I call a Dataframe using Pandas. I've uploaded a csv.file.</p>
  
  <p><a href="https://i.stack.imgur.com/O7rXb.png" rel="noreferrer"><img src="https://i.stack.imgur.com/O7rXb.png" alt="dataset from csv"></a></p>
  
  <p>When I type <code>data.Country</code> and <code>data.Year</code>, I get the 1st Column and the second one displayed. However when I type <code>data.Number</code>, everytime it gives me this error: </p>
  
  <blockquote>
    <p>AttributeError: 'DataFrame' object has no attribute 'Number'.</p>
  </blockquote>