我正在尝试设置Python(3.4)代码,按日期对时间序列进行排序。
在python shell中,我键入以下内容
>>>data = quandl.get("YAHOO/INDEX_GSPC", start_date="2017-01-01", end_date="2017-01-20")
>>>print(data)
所以,我可以加载数据。但是当我尝试使用命令
进行排序时>>>data = data.sort_values(by='Date')
我收到以下错误消息列表。我似乎无法从http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.sort_values.html
了解/获取日期排序的语法那里的专家.......,非常感谢您的建议。
Traceback (most recent call last):
File "C:\Python34\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: 'Date'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<pyshell#37>", line 1, in <module>
data = data.sort_values(by='Date')
File "C:\Python34\lib\site-packages\pandas\core\frame.py", line 3230, in sort_values
k = self.xs(by, axis=other_axis).values
File "C:\Python34\lib\site-packages\pandas\core\generic.py", line 1770, in xs
return self[key]
File "C:\Python34\lib\site-packages\pandas\core\frame.py", line 2059, in __getitem__
return self._getitem_column(key)
File "C:\Python34\lib\site-packages\pandas\core\frame.py", line 2066, in _getitem_column
return self._get_item_cache(key)
File "C:\Python34\lib\site-packages\pandas\core\generic.py", line 1386, in _get_item_cache
values = self._data.get(item)
File "C:\Python34\lib\site-packages\pandas\core\internals.py", line 3543, in get
loc = self.items.get_loc(item)
File "C:\Python34\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: 'Date'
答案 0 :(得分:1)
quandl.get
加载DataFrame
,日期为索引。
因此,如果您按索引排序,那么您就可以了:
data = data.sort_index()
答案 1 :(得分:0)
确保查看错误。您收到KeyError
,表示您的DataFrame中不存在Date
列。就像日期存储在索引中一样,需要使用sort_index
方法。您在DataFrame中看到的“日期”名称是索引的名称,而不是列。
data.sort_index()