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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_card(self, index=-1, cache=True, remove=True):
 """ Retrieve a card any number of cards from the top. Returns a ``Card`` object loaded from a library if one is specified otherwise just it will simply return its code. If `index` is not set then the top card will be retrieved. If cache is set to True (the default) it will tell the library to cache the returned card for faster look-ups in the future. If remove is true then the card will be removed from the deck before returning it. """

        if len(self.cards) < index:
            return None

        retriever = self.cards.pop if remove else self.cards.__getitem__
        code = retriever(index)

        if self.library:
            return self.library.load_card(code, cache)
        else:
            return code