def create_child_folder(self, folder_name):
if not folder_name:<EOL><INDENT>return None<EOL><DEDENT>if self.root:<EOL><INDENT>url = self.build_url(self._endpoints.get('<STR_LIT>'))<EOL><DEDENT>else:<EOL><INDENT>url = self.build_url(<EOL>self._endpoints.get('<STR_LIT>').format(id=self.folder_id))<EOL><DEDENT>response = self.con.post(url,<EOL>data={self._cc('<STR_LIT>'): folder_name})<EOL>if not response:<EOL><INDENT>return None<EOL><DEDENT>folder = response.json()<EOL>return self.__class__(parent=self, **{self._cloud_data_key: folder})<EOL>
Creates a new child folder

        :param str folder_name: name of the new folder to create
        :return: newly created folder
        :rtype: ContactFolder or None