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python - 每当我尝试将值放入训练数据时，它都会显示关键错误

问题描述

import pandas as pd
fruits  = pd.read_csv('fruit_data_with_colors.txt')
fruits.head()
X= fruits['mass','height','width']

> Error - KeyError                                  Traceback (most
> recent call last)
> C:\Python\Python37\ANACONDA3\lib\site-packages\pandas\core\indexes\base.py
> in get_loc(self, key, method, tolerance)    2656             try:
> -> 2657                 return self._engine.get_loc(key)    2658             except KeyError:
> 
> pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
> 
> pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
> 
> pandas/_libs/hashtable_class_helper.pxi in
> pandas._libs.hashtable.PyObjectHashTable.get_item()
> 
> pandas/_libs/hashtable_class_helper.pxi in
> pandas._libs.hashtable.PyObjectHashTable.get_item()
> 
> KeyError: ('mass', 'height', 'width')
> 
> During handling of the above exception, another exception occurred:
> 
> KeyError                                  Traceback (most recent call
> last) <ipython-input-13-f018d289c28d> in <module>
> ----> 1 X= fruits['mass','height','width']
> 
> C:\Python\Python37\ANACONDA3\lib\site-packages\pandas\core\frame.py in
> __getitem__(self, key)    2925             if self.columns.nlevels > 1:    2926                 return self._getitem_multilevel(key)
> -> 2927             indexer = self.columns.get_loc(key)    2928             if is_integer(indexer):    2929                 indexer = [indexer]
> 
> C:\Python\Python37\ANACONDA3\lib\site-packages\pandas\core\indexes\base.py
> in get_loc(self, key, method, tolerance)    2657                
> return self._engine.get_loc(key)    2658             except KeyError:
> -> 2659                 return self._engine.get_loc(self._maybe_cast_indexer(key))    2660        
> indexer = self.get_indexer([key], method=method, tolerance=tolerance) 
> 2661         if indexer.ndim > 1 or indexer.size > 1:
> 
> pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
> 
> pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
> 
> pandas/_libs/hashtable_class_helper.pxi in
> pandas._libs.hashtable.PyObjectHashTable.get_item()
> 
> pandas/_libs/hashtable_class_helper.pxi in
> pandas._libs.hashtable.PyObjectHashTable.get_item()
> 
> KeyError: ('mass', 'height', 'width')

标签： pythonpandas

解决方案

尝试将最后一行更改为

X = fruits[['mass','height','width']]

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