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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 page_size(self) -> int: """ A property that returns how large a page is, calculated from the paginator properties. If this exceeds `max_page_size`, an exception is raised upon instantiation. """

        page_count = self.page_count
        return self.paginator.max_size + len(f'\nPage {page_count}/{page_count}')