title: KeyError: [......] not in index
body: <p>I am relatively new to Python, and when I am doing homework, I met the following Problems.</p>
  
  <p>This is for a new starter for tensorflow and panda</p>
  
  <pre><code>zerlite_13X_error = pd.read_csv("zerlite_13x_error.csv", sep=",")
  def preprocess_features(zerlite_13X_error):
      """Prepares input features from zerlite_13X_error
      Args:
      zerlite_13X_error: A Pandas DataFrame expected to contain data
  
      Return:
      A DataFrame that contains the features to be used for the model.
  including synthetic features
      """
      selected_features = zerlite_13X_error[
          ["Parameter 1",
           "Parameter 2",
           "Parameter 3",
           "Parameter 4",
           "Parameter 5",
           "Parameter 6",
           "Parameter 7",
           "Parameter 8"]]
      processed_features = selected_features.copy()
      print(processed_features.head())
      return processed_features
  
  preprocess_features(zerlite_13X_error)
  </code></pre>
  
  <blockquote>
    <p>KeyError: "['Parameter 7', 'Parameter 8', 'Parameter 2', 'Parameter 3', 'Parameter 4', 'Parameter 5', 'Parameter 6'] not in index"
    in  preprocess_features(zerlite_13X_error)</p>
  </blockquote>