Question

我正在尝试运行一个简单的脚本来按列对数据帧进行排序，但是会因此错误而被抛弃。

我正在尝试运行以下代码：

import pandas as pd

df = pd.read_excel('pandas_test.xlsx', sheetname='mydata')
print df
df.sort_values(by = 'Prediction', ascending=[False], inplace=True)

这是读出来的

             Name    Code  Prediction   Unnamed: 3  Unnamed: 4
0           Aiden    ADN     -0.904636   -0.897691   -0.897691
1        ARCHcoin   ARCH      0.058027    0.279917    0.279917
2         ArtByte    ABY      0.083942    0.396728    0.262711
3       BellaCoin   BELA     -0.622574   -0.357308    0.348456
4    Bitcoin Plus    XBC     -0.862629   -0.862629   -0.927854
5     BitcoinDark   BTCD     -0.349041   -0.495764   -0.071606
6         Bitmark    BTM     -0.712551   -0.686572   -0.686910
7       BitShares     BTS     0.658777    0.645338    0.653746
8   BitShares PTS    PTS     -0.009761   -0.599135   -0.404015
9         Bitstar   BITS      0.365824    0.388928    0.541017
10      BlackCoin    BLK     -0.153565   -0.040735    0.348264
11       Blocknet  BLOCK      0.172974    0.403764   -0.011830
12      Boolberry    BBR     -0.556053   -0.570189   -0.441098
13      Boolberry     BBR    -0.556053   -0.570189   -0.441098
14          Burst  BURST     -0.302751   -0.301617   -0.201896
Traceback (most recent call last):
  File "C:\Users\David\Desktop\Python\JSON\pandas_test.py", line 17, in <module>
    df.sort_values(by = 'Prediction', ascending=[False], inplace=True)
  File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 3098, in sort_values
    k = self[by].values
  File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1969, in __getitem__
    return self._getitem_column(key)
  File "C:\Python27\lib\site-packages\pandas\core\frame.py", line 1976, in _getitem_column
    return self._get_item_cache(key)
  File "C:\Python27\lib\site-packages\pandas\core\generic.py", line 1091, in _get_item_cache
    values = self._data.get(item)
  File "C:\Python27\lib\site-packages\pandas\core\internals.py", line 3211, in get
    loc = self.items.get_loc(item)
  File "C:\Python27\lib\site-packages\pandas\core\index.py", line 1759, in get_loc
    return self._engine.get_loc(key)
  File "pandas\index.pyx", line 137, in pandas.index.IndexEngine.get_loc (pandas\index.c:3979)
  File "pandas\index.pyx", line 157, in pandas.index.IndexEngine.get_loc (pandas\index.c:3843)
  File "pandas\hashtable.pyx", line 668, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12265)
  File "pandas\hashtable.pyx", line 676, in pandas.hashtable.PyObjectHashTable.get_item (pandas\hashtable.c:12216)
KeyError: 'Prediction'
[Finished in 1.0s with exit code 1]

这不是让我发帖，因为它说我主要是代码，即使它主要是错误日志，我会在这里喋喋不休，直到我有足够的文字

Answer 1

Sort_values已折旧！请改用df.sort。

 df.sort(columns=None, axis=0, ascending=False, 
                    inplace=False,kind='quicksort', na_position='last')

Inplace参数还需要一个boolian False 而不是列表 [False]

使用简单的pandas脚本时出错

1 个答案: