Question

我已经使用pandas成功读取了一个csv文件。当我尝试从数据框中打印特定列时，我得到了keyerror。因此，我正在与错误共享代码。

import pandas as pd
reviews_new = pd.read_csv("D:\\aviva.csv")
reviews_new['review']

**

reviews_new['review']
Traceback (most recent call last):
  File "<ipython-input-43-ed485b439a1c>", line 1, in <module>
    reviews_new['review']
  File "C:\Users\30216\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\core\frame.py", line 1997, in __getitem__
    return self._getitem_column(key)
  File "C:\Users\30216\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\core\frame.py", line 2004, in _getitem_column
    return self._get_item_cache(key)
  File "C:\Users\30216\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\core\generic.py", line 1350, in _get_item_cache
    values = self._data.get(item)
  File "C:\Users\30216\AppData\Local\Continuum\Anaconda2\lib\site-packages\pandas\core\internals.py", line 3290, in get
    loc = self.items.get_loc(item)
  File "C:\Users\30216\AppData\Local\Continuum\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: 'review'

**

有人可以帮助我吗？

Answer 1

我认为可能存在两个问题（显然）：

1.列名称中的空格（也可能在数据中）

解决方案是列名中的strip个空格：

reviews_new.columns = reviews_new.columns.str.strip()

或者将参数skipinitialspace添加到read_csv：

reviews_new = pd.read_csv("D:\\aviva.csv", skipinitialspace=True)

2.不同的分隔符为默认,

解决方案是添加参数sep：

#sep is ;
reviews_new = pd.read_csv("D:\\aviva.csv", sep=';')
#sep is whitespace
reviews_new = pd.read_csv("D:\\aviva.csv", sep='\s+')
reviews_new = pd.read_csv("D:\\aviva.csv", delim_whitespace=True)

编辑：

您在列名中获得空格，因此需要1.solutions：

print (reviews_new.columns.tolist())
['Name', ' Date', ' review'] 
          ^        ^

Answer 2

import pandas as pd
df=pd.read_csv("file.txt", skipinitialspace=True)
df.head()
df['review']

Answer 3

dfObj['Hash Key'] = (dfObj['DEAL_ID'].map(str) +dfObj['COST_CODE'].map(str) +dfObj['TRADE_ID'].map(str)).apply(hash)

#for index, row in dfObj.iterrows():
#        dfObj.loc[`enter code here`index,'hash'] = hashlib.md5(str(row[['COST_CODE','TRADE_ID']].values)).hexdigest()

print(dfObj['hash'])

错误：pandas hashtable keyerror

3 个答案: