def remove_all(self, *tagnames):
        for tagname in tagnames:
            matching = self.findall(qn(tagname))
            for child in matching:
                self.remove(child)
Remove all child elements whose tagname (e.g. 'a:p') appears in
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/xmlchemy.py/_OxmlElementBase.remove_all