TypeError：无法使用<class'str'>

Question

  

TypeError：无法使用

的这些索引器[Moran，Mr.James]进行切片索引

这是一个正在研究的录像带，我没有他们的数据。我添加了一些可以在我自己的数据中使用的数据。当我打印数据索引时，它运行得很好，但是当我尝试从索引中切片数据时，它无法运行并给了我一些错误信息

import pandas as pd
# will return a new DataFrame that is indexed by the values in the specified column
# and will drop that cloumn from the DataFrame
# without the PannengerId dropped

# DataFrame来指定一个索引值

passenger_data = pd.read_csv('titanic/train.csv')
print(type(passanger_data) )
passenger_ticket = passanger_data.set_index('Name',drop=False) # 把ticket当成一个索引
print(passenger_ticket.index) # 打印index 值

#
# 目前怀疑是数据的问题，一下索引都失败了
# 具体问题详

print('\n\n\n\n=========================')
#Slice using either bracket notation or loc[]
passenger_data["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]

# Specific ticiket
passanger_data.loc["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]

# Select list of movies
tickets  = ["Sandstrom,Miss.Marguerite Rut","Moran,Mr.James","Rice,Master.Eugene"]
passenger_data.loc[tickets]

答案计算机

<class 'pandas.core.frame.DataFrame'>
Index(['Braund, Mr. Owen Harris',
       'Cumings, Mrs. John Bradley (Florence Briggs Thayer)',
       'Heikkinen, Miss. Laina',
       'Futrelle, Mrs. Jacques Heath (Lily May Peel)',
       'Allen, Mr. William Henry', 'Moran, Mr. James',
       'McCarthy, Mr. Timothy J', 'Palsson, Master. Gosta Leonard',
       'Johnson, Mrs. Oscar W (Elisabeth Vilhelmina Berg)',
       'Nasser, Mrs. Nicholas (Adele Achem)',
       ...
       'Markun, Mr. Johann', 'Dahlberg, Miss. Gerda Ulrika',
       'Banfield, Mr. Frederick James', 'Sutehall, Mr. Henry Jr',
       'Rice, Mrs. William (Margaret Norton)', 'Montvila, Rev. Juozas',
       'Graham, Miss. Margaret Edith',
       'Johnston, Miss. Catherine Helen "Carrie"', 'Behr, Mr. Karl Howell',
       'Dooley, Mr. Patrick'],
      dtype='object', name='Name', length=891)




=========================

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-24-a5b969b8a3ba> in <module>
     13 print('\n\n\n\n=========================')
     14 #Slice using either bracket notation or loc[]
---> 15 passenger_data["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]
     16 
     17 # Specific ticiket

F:\Software\PYTHON\lib\site-packages\pandas\core\frame.py in __getitem__(self, key)
   2959 
   2960         # Do we have a slicer (on rows)?
-> 2961         indexer = convert_to_index_sliceable(self, key)
   2962         if indexer is not None:
   2963             return self._slice(indexer, axis=0)

F:\Software\PYTHON\lib\site-packages\pandas\core\indexing.py in convert_to_index_sliceable(obj, key)
   2356     idx = obj.index
   2357     if isinstance(key, slice):
-> 2358         return idx._convert_slice_indexer(key, kind="getitem")
   2359 
   2360     elif isinstance(key, str):

F:\Software\PYTHON\lib\site-packages\pandas\core\indexes\base.py in _convert_slice_indexer(self, key, kind)
   3188             if self.is_integer() or is_index_slice:
   3189                 return slice(
-> 3190                     self._validate_indexer("slice", key.start, kind),
   3191                     self._validate_indexer("slice", key.stop, kind),
   3192                     self._validate_indexer("slice", key.step, kind),

F:\Software\PYTHON\lib\site-packages\pandas\core\indexes\base.py in _validate_indexer(self, form, key, kind)
   5069             pass
   5070         elif kind in ["iloc", "getitem"]:
-> 5071             self._invalid_indexer(form, key)
   5072         return key
   5073 

F:\Software\PYTHON\lib\site-packages\pandas\core\indexes\base.py in _invalid_indexer(self, form, key)
   3338             "cannot do {form} indexing on {klass} with these "
   3339             "indexers [{key}] of {kind}".format(
-> 3340                 form=form, klass=type(self), key=key, kind=type(key)
   3341             )
   3342         )

TypeError: cannot do slice indexing on <class 'pandas.core.indexes.range.RangeIndex'> with these indexers [Moran,Mr.James] of <class 'str'>

Answer 1

您在错误的数据帧上切片：

passenger_data["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]

是您正在做的，但是实际的索引被写到了一个不同的数据框中

passenger_ticket["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]

或者也应该是

passenger_ticket.loc["Moran,Mr.James":"Sandstrom,Miss.Marguerite Rut"]

PS：正如@jezrael所提到的，我刚刚意识到...