def get_dimension(self, dimension_key):
        """
        Extracts the dimension from the style dict of the Element and returns it as a float.
        """
        dimension = self.style_dict.get(dimension_key)
        if dimension:
            if dimension[-2:] in ['px', 'em', 'pt', 'in', 'cm']:
                dimension = dimension[:-2]
            dimension = float(dimension)
        return dimension

        Extracts the dimension from the style dict of the Element and returns it as a float.
        
ptstructure/table/tablepyxl/style.py