title: AttributeError: 'DataFrame' object has no attribute
body: <p>I keep getting different attribute errors when trying to run this file in ipython...beginner with pandas so maybe I'm missing something</p>
  
  <p>Code:</p>
  
  <pre><code>from pandas import Series, DataFrame
  
  import pandas as pd
  
  import json
  
  nan=float('NaN')
  data = []
  with open('file.json') as f:
  for line in f:
      data.append(json.loads(line))
  
  df = DataFrame(data, columns=['accepted', 'user', 'object', 'response'])
  clean = df.replace('NULL', nan)
  clean = clean.dropna()
  
  print clean.value_counts() 
  
  AttributeError: 'DataFrame' object has no attribute 'value_counts'
  </code></pre>
  
  <p>Any ideas?</p>