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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 inner_horizontal_border(self):
 """ The complete inner horizontal border section, including the left and right border verticals. Returns: str: The complete inner horizontal border. """

        return u"{lm}{lv}{hz}{rv}".format(lm=' ' * self.margins.left,
                                          lv=self.border_style.outer_vertical_inner_right,
                                          rv=self.border_style.outer_vertical_inner_left,
                                          hz=self.inner_horizontals())