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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 _to_dict_of_blocks(self, copy=True):
 """ Return a dict of dtype -> Constructor Types that each is a homogeneous dtype. Internal ONLY """

        return {k: self._constructor(v).__finalize__(self)
                for k, v, in self._data.to_dict(copy=copy).items()}