<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def read(self, n):
                '''read some bytes'''
                if len(self.buf) == 0:
                        self._recv()
                if len(self.buf) > 0:
                        if n > len(self.buf):
                                n = len(self.buf)
                        ret = self.buf[:n]
                        self.buf = self.buf[n:]
                        if self._debug >= 2:
                            for b in ret:
                                self.debug("read 0x%x" % ord(b), 2)
                        return ret
                return ''