def peek(self, bytes):
        if bytes < self._lenfirst - self._offset:
            return buffer(self._bufvec[0], self._offset, bytes)
        return flatten(self.peek_seq(bytes))
Return the requested number of bytes from the start of the
dataset/ETHPy150Open arkadini/twimp/twimp/vecbuf.py/VecBuf.peek