def send_and_expect()

in tools/tftp_tester.py [0:0]
37 lines of code
15 McCabe index (conditional complexity)

    def send_and_expect(self, packet, expect, cur):
        retries = 0
        while retries < self.retries:
            begin = time.time()

            if cur in self.failsend:  # pretend we sent a packet which was lost
                self.failsend.remove(cur)
            else:
                self.send(packet)

            try:
                answer, sender_addr = self.sock.recvfrom(self.blksize + 4)
                self.port = sender_addr[1]
                if self.verbose:
                    self.spinner.show()

                num = get_packet_num(answer)

                # is this the last packet?
                is_last = (
                    get_packet_type(answer) == TFTP.DATA
                    and len(get_packet_data(answer)) < self.actual_blksize
                )

                # replace -1 with the actual packet number in failreceive
                # this allows us to use the same construction for all packets
                if is_last and (-1 in self.failreceive):
                    self.failreceive[self.failreceive.index(-1)] = num

                # pretend we didn't receive any message
                if num in self.failreceive:
                    self.failreceive.remove(num)
                    delta = time.time() - begin
                    time.sleep(self.timeout - delta)
                    raise socket.timeout()

                # if it's the next DATA or an OACK, we're good
                if get_packet_type(answer) == expect:
                    if (expect == TFTP.DATA and num == cur + 1) or (
                        expect == TFTP.OACK
                    ):
                        break
                elif get_packet_type(answer) == TFTP.ERROR:
                    raise TftpException(answer[4:-1].decode("ascii"))
                else:
                    print("\nUnexpected packet received. Ignoring")
            except socket.timeout:
                retries += 1
        return answer