human
Write me a the Python code you requested given the following:
I am working on the file "Python/Local-Search-Engine.ipynb".
The first task is:
The class Index contains three member variables:
  - InvertedIndex is a dictionary that maps every word to the set of documents containing this word.
    In this set, the documents are represented by their unique identifiers.
  - ID2Doc is a dictionary mapping the document identifiers to the corresponding Document objects.
  - fileCount is a counter that is needed to create unique document identifiers.
Can you write Python code for it?
assistant
#Here is the Python code you requested.

class Index:
    def __init__(self):
        self.InvertedIndex = {}
        self.ID2Doc        = {}
        self.fileCount     = 0