title: pandas invalid literal for long() with base 10 error
body: <p>I am trying to do:  <code>df['Num_Detections'] = df['Num_Detections'].astype(int)</code></p>
  
  <p>And i get following error: </p>
  
  <blockquote>
    <p>ValueError: invalid literal for long() with base 10: '12.0'</p>
  </blockquote>
  
  <p>My data looks looks following:</p>
  
  <pre><code>&gt;&gt;&gt; df['Num_Detections'].head()
  Out[6]: 
  sku_name
  DOBRIY MORS GRAPE-CRANBERRY-RASBERRY 1L     12.0
  AQUAMINERALE 5.0L                            9.0
  DOBRIY PINEAPPLE 1.5L                        2.0
  FRUKT.SAD APPLE 0.95L                      154.0
  DOBRIY PEACH-APPLE 0.33L                    71.0
  Name: Num_Detections, dtype: object
  </code></pre>
  
  <p>Any idea how to do the conversion correctly ?</p>
  
  <p>Thanks for help.</p>