title: Check for None in pandas dataframe
body: <p>I would like to find where None is found in the dataframe.</p>
  
  <pre><code>pd.DataFrame([None,np.nan]).isnull()
  OUT: 
        0
  0  True
  1  True
  </code></pre>
  
  <p>isnull() finds both numpy Nan and None values.</p>
  
  <p>I only want the None values and not numpy Nan. Is there an easier way to do that without looping through the dataframe?</p>
  
  <p>Edit:
  After reading the comments, I realized that in my dataframe in my work also include strings, so the None were not coerced to numpy Nan. So the answer given by Pisdom works.</p>