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The __delslice__ method

__delslice__(self, i, j)

Called to implement deletion of self[i:j]. Same notes for i and j as for __getslice__. This method is deprecated. If no __delslice__ is found, or for extended slicing of the form self[i:j:k], a slice object is created, and passed to __delitem__, instead of __delslice__ being called.