如何解决KeyError：“ [Index（['t1']，dtype ='object'）]都不在[列]中”

Question

我正在尝试运行在github上找到的用于超参数优化和网格搜索的代码。因此，我的csv文件的内容为：

所以，我的代码是：

import pandas as pd
import svm

from random import randint
from sklearn import svm

#read data
dataframe=pd.read_csv("treshold1.csv")


X = dataframe[['t1']]
y = dataframe[['t2']]
best_score = 0  
best_params = {'C': None, 'gamma': None}

#for a preset number of iterations
for i in range(10):
    #try random values for each hyperparameter
    svc = svm.SVC(C=randint(0, 9), gamma=randint(0, 3))
    svc.fit(X, y)
    score = svc.score(Xval, yval)

    if score > best_score:
        best_score = score
        best_params['C'] = C
        best_params['gamma'] = gamma

best_score, best_params 

运行后，出现此错误：

 Traceback (most recent call last):
  File "g:/Maksa/Programiranje/Python/SI/image_quality_assessment-master/common/s.py", line 11, in <module>
    X = dataframe[['t1']]
  File "C:\Users\ftnkm\AppData\Local\Programs\Python\Python36\lib\site-packages\pandas\core\frame.py", line 3001, in __getitem__
    indexer = self.loc._convert_to_indexer(key, axis=1, raise_missing=True)
  File "C:\Users\ftnkm\AppData\Local\Programs\Python\Python36\lib\site-packages\pandas\core\indexing.py", line 1285, in _convert_to_indexer
    return self._get_listlike_indexer(obj, axis, **kwargs)[1]
  File "C:\Users\ftnkm\AppData\Local\Programs\Python\Python36\lib\site-packages\pandas\core\indexing.py", line 1092, in _get_listlike_indexer
    keyarr, indexer, o._get_axis_number(axis), raise_missing=raise_missing
  File "C:\Users\ftnkm\AppData\Local\Programs\Python\Python36\lib\site-packages\pandas\core\indexing.py", line 1177, in _validate_read_indexer
    key=key, axis=self.obj._get_axis_name(axis)
KeyError: "None of [Index(['t1'], dtype='object')] are in the [columns]"

Answer 1

我相信您只需要将列分隔符和小数点分隔符精确到read_csv函数即可。请注意，它期望使用“，”和“。”默认。 尝试： dataframe = pd.read_csv（“ treshold1.csv”，sep =“;”，十进制=“，”）

Answer 2

如果您的输入文件确实由逗号分隔，则您的代码实际上可以运行。

但是，由于您获得了KeyError，因此您的输入文件treshold1.csv可能没有用逗号分隔。

从“ csv”文件内容的屏幕快照中猜测，我认为您的输入文件可能是制表符分隔的。修复它，它应该修复KeyError。