title: How do I remove numbers and/or parenthesis from names in a DataFrame column
body: <p>Within my column I have several country names that contain numbers and/or parenthesis in their name that I need to remove.</p>
  <p>For example:</p>
  <ul>
  <li>'Bolivia (Plurinational State of)' should be 'Bolivia'</li>
  <li>'Switzerland17' should be 'Switzerland'</li>
  </ul>
  <p>The column in question is also set as my index if that impacts things?</p>