The block sections of code to be used as substitutions

        :rtype: Section, list(Section)

def section(self, section):
        """The block sections of code to be used as substitutions

        :rtype: Section, list(Section)
        """
        if isinstance(section, list):
            for h in section:
                self.add_section(h)
        else:
            self.add_section(section)