［Python数据分析］新股破板买入，赚钱几率如何？

此时却出了问题，报错如下：

>>> df=df[['date','open','close','p_change']]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shengtianhe/anaconda/lib/python3.5/site-packages/pandas/core/frame.py", line 1991, in __getitem__
    return self._getitem_array(key)
  File "/Users/shengtianhe/anaconda/lib/python3.5/site-packages/pandas/core/frame.py", line 2035, in _getitem_array
    indexer = self.ix._convert_to_indexer(key, axis=1)
  File "/Users/shengtianhe/anaconda/lib/python3.5/site-packages/pandas/core/indexing.py", line 1214, in _convert_to_indexer
    raise KeyError('%s not in index' % objarr[mask])
KeyError: "['date'] not in index"

（编辑：源码网）

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