python3实现高效的端口扫描

import sysimport nmapscan_row = []input_data = input('Please input hosts and port: ')#scan_row以空格分隔scan_row = input_data.split(' ')if len(scan_row) != 2: print("Input errors, example /"192.168.209.0/24 80,443,22 /"") sys.exit(0)#接收用户输入的主机hosts = scan_row[0]#接收用户收入的端口port = scan_row[1]try: #创建端口扫描对象 nm = nmap.PortScanner()except nmap.PortScannerError: print('Nmap not found', sys.exc_info()[0]) sys.exit(0)except Exception as e: print("Unexpected error:", sys.exc_info()[0]) print(str(e)) sys.exit(0)try: #调用扫描方法，参数指定扫描主机hosts，nmap扫描命令行参数arguments nm.scan(hosts=hosts, arguments=' -v -sS -p ' + port)except Exception as e: print("Scan error:" + str(e))for host in nm.all_hosts(): print('---------------------------------------------------------------------') #输出主机及主机名 print('Host : %s (%s)' % (host, nm[host].hostname())) #输出主机状态，如up、down print('State : %s' % nm[host].state()) #遍历扫描协议，tcp、udp for proto in nm[host].all_protocols():  print('--------------')  #输出协议名  print('Protocol : %s' % proto)  #获取协议的所有扫描端口  lport = list(nm[host][proto].keys())  #端口列表排序  lport.sort()  #遍历端口输出端口与状态  for port in lport:   print('port %s/tstate : %s' % (port, nm[host][proto][port]['state']))