title: How to get a value from a Pandas DataFrame and not the index and object type
body: <p>Say I have the following DataFrame</p>
  <pre>
  Letter    Number
  A          1
  B          2
  C          3
  D          4
  </pre>
  <p>Which can be obtained through the following code</p>
  <pre><code>import pandas as pd
  
  letters = pd.Series(('A', 'B', 'C', 'D'))
  numbers = pd.Series((1, 2, 3, 4))
  keys = ('Letters', 'Numbers')
  df = pd.concat((letters, numbers), axis=1, keys=keys)
  </code></pre>
  <p>Now I want to get the value C from the column Letters.</p>
  <p>The command line</p>
  <pre><code>df[df.Letters=='C'].Letters
  </code></pre>
  <p>will return</p>
  <pre>
  2    C
  Name: Letters, dtype: object
  </pre>
  <p>How can I get only the value C and not the whole two line output?</p>