title: Drop all data in a pandas dataframe
body: <p>I would like to drop all data in a pandas dataframe, but am getting <code>TypeError: drop() takes at least 2 arguments (3 given)</code>. I essentially want a blank dataframe with just my columns headers.</p>
  
  <pre><code>import pandas as pd
  
  web_stats = {'Day': [1, 2, 3, 4, 2, 6],
               'Visitors': [43, 43, 34, 23, 43, 23],
               'Bounce_Rate': [3, 2, 4, 3, 5, 5]}
  df = pd.DataFrame(web_stats)
  
  df.drop(axis=0, inplace=True)
  print df
  </code></pre>