报错了。。。
"C:\Program Files\Anaconda2\python.exe" C:/Users/niko/Desktop/计算创业板平均市盈率.py
Traceback (most recent call last):
File "C:/Users/niko/Desktop/���㴴ҵ��ƽ����ӯ��.py", line 42, in <module>
output = all_stock.groupby('date')[['market_value', '净利润']].sum()
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\generic.py", line 3778, in groupby
**kwargs)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\groupby.py", line 1427, in groupby
return klass(obj, by, **kwds)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\groupby.py", line 354, in __init__
mutated=self.mutated)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\groupby.py", line 2383, in _get_grouper
in_axis, name, gpr = True, gpr, obj[gpr]
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\frame.py", line 1997, in __getitem__
return self._getitem_column(key)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\frame.py", line 2004, in _getitem_column
return self._get_item_cache(key)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\generic.py", line 1350, in _get_item_cache
values = self._data.get(item)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\core\internals.py", line 3290, in get
loc = self.items.get_loc(item)
File "C:\Program Files\Anaconda2\lib\site-packages\pandas\indexes\base.py", line 1947, in get_loc
return self._engine.get_loc(self._maybe_cast_indexer(key))
File "pandas\index.pyx", line 137, in pandas.index.IndexEngine.get_loc (pandas\index.c:4154)
File "pandas\index.pyx", line 159, in pandas.index.IndexEngine.get_loc (pandas\index.c:4018)
File "pandas\hashtable.pyx", line 675, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12368)
File "pandas\hashtable.pyx", line 683, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12322)
KeyError: 'date'
Process finished with exit code 1
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