KeyError: 'longitude' when reading from csv file [duplicate] - python-3.x

Question

I have successfully read a csv file using pandas. When I am trying to print the a particular column from the data frame i am getting keyerror. Hereby i am sharing the code with the error.
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'
**
Can someone help me in this ?

Answer 1

I think first is best investigate, what are real columns names, if convert to list better are seen some whitespaces or similar:
print (reviews_new.columns.tolist())
I think there can be 2 problems (obviously):
1.whitespaces in columns names (maybe in data also)
Solutions are strip whitespaces in column names:
reviews_new.columns = reviews_new.columns.str.strip()
Or add parameter skipinitialspace to read_csv:
reviews_new = pd.read_csv("D:\\aviva.csv", skipinitialspace=True)
2.different separator as default ,
Solution is add parameter 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)
EDIT:
You get whitespace in column name, so need 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'])