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我正在尝试将“ID”作为索引，它会抛出下面提到的错误并且图像：

obj= pd.read_csv("Supermarkets.csv")
obj

  ID   Address       City Country           Name  Number
0    1  Ecity-1  Bangalore   India   village mart       2
1    2  Ecity-2     Mysore   India           More       3
2    3  Ecity-3    Dharwad   India     Bigg bazar       1
3    4  Ecity-4     Haveri   India     Super Mart       2
4    5  Ecity-5     Badami   India  Kirani angadi       1

obj.set_index("ID")

错误：

Traceback (most recent call last):
  File "C:\Users\sharathkumar.chattar\AppData\Local\Programs\Python\Python36-32\lib\site-packages\pandas\core\indexes\base.py", line 2656, in get_loc
    return self._engine.get_loc(key)
  File "pandas\_libs\index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\hashtable_class_helper.pxi", line 1601, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas\_libs\hashtable_class_helper.pxi", line 1608, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'ID'