title: Scikit-learn - Impute values in a specific column
body: <p>Is it possible to impute values for a specific column?</p>
  <p>For example, if I have 3 columns:</p>
  <ul>
  <li><em><strong>A</strong></em> (categorical): does not contain any missing values</li>
  <li><em><strong>B</strong></em> (numeric): does not contain any missing values</li>
  <li><em><strong>C</strong></em>: suppose this column contains numerics data and some of them are missing . I want to do the imputation only in this column.</li>
  </ul>