def before_convert(self, buf):
        #buf.append('_buf = []; ')
        if self.preamble:
            buf.append(self.preamble)
            buf.append(self.input.startswith('<?py') and "\n" and "; ")
dataset/ETHPy150Open rst2pdf/rst2pdf/rst2pdf/tenjin.py/Template.before_convert/operator `or` -> `and`