title: Pandas error in python 3.5.1
body: <p>I am using python 3.5.1,   Following shows data</p>
  
  <pre><code>import pandas as pd
  import quandl
  df = quandl.get('WIKI/GOOGL')
  print(df.head())
  </code></pre>
  
  <p>I am doing following</p>
  
  <pre><code>import pandas as pd
  import quandl
  df = quandl.get('WIKI/GOOGL')
  
  df = df[['Adj. Open','Adj. High','Adj. Low','Adj. Close','Adj. Volume',]]
  df['HL_PCT'] = (df['Adj. High'] - df['Adj. Close']) / df['Adj. Close']*100.0
  df['PCT_change'] = (df['Adj. Close'] - df['Adj. Open']) / df['Adj. OPen']*100.0
  df = df[['Adj. Close','HL_PCT','PCT_change','Adj. Volume']]
  
  print(df.head())
  </code></pre>
  
  <p>but its showing following error </p>
  
  <p>Traceback (most recent call last):
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\indexes\base.py", line 2134, in get_loc
      return self._engine.get_loc(key)
    File "pandas\index.pyx", line 132, in pandas.index.IndexEngine.get_loc (pandas\index.c:4433)
    File "pandas\index.pyx", line 154, in pandas.index.IndexEngine.get_loc (pandas\index.c:4279)
    File "pandas\src\hashtable_class_helper.pxi", line 732, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:13742)
    File "pandas\src\hashtable_class_helper.pxi", line 740, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:13696)
  KeyError: 'Adj. OPen'</p>
  
  <p>During handling of the above exception, another exception occurred:</p>
  
  <p>Traceback (most recent call last):
    File "C:/Users/jayram/Desktop/python/ok2", line 7, in 
      df['PCT_change'] = (df['Adj. Close'] - df['Adj. Open']) / df['Adj. OPen']*100.0
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\core\frame.py", line 2059, in <strong>getitem</strong>
      return self._getitem_column(key)
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\core\frame.py", line 2066, in _getitem_column
      return self._get_item_cache(key)
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\core\generic.py", line 1386, in _get_item_cache
      values = self._data.get(item)
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\core\internals.py", line 3543, in get
      loc = self.items.get_loc(item)
    File "C:\Users\jayram\AppData\Local\Programs\Python\Python35\lib\site-packages\pandas\indexes\base.py", line 2136, in get_loc
      return self._engine.get_loc(self._maybe_cast_indexer(key))
    File "pandas\index.pyx", line 132, in pandas.index.IndexEngine.get_loc (pandas\index.c:4433)
    File "pandas\index.pyx", line 154, in pandas.index.IndexEngine.get_loc (pandas\index.c:4279)
    File "pandas\src\hashtable_class_helper.pxi", line 732, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:13742)
    File "pandas\src\hashtable_class_helper.pxi", line 740, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:13696)
  KeyError: 'Adj. OPen'</p>
  
  <p>Process finished with exit code 1</p>
  
  <p>how to solve above error</p>