def METHOD_NAME(self, number, attributes=[]):
    # Optimized tag writer for <c> cell number elements in the inner loop.
    attr = ""
    for key, value in attributes:
        value = self._escape_attributes(value)
        attr += ' %s="%s"' % (key, value)
    self.fh.write("""<c%s><v>%.16G</v></c>""" % (attr, number))