python 端口扫描小程序 求助

康熙

求技术牛帮忙分析下代码，不知道哪里出错了。运行程序没有报错，但是输入IP 跟 port 之后没反应 程序就结束掉了。   求j指出问题给出意见。

谢谢！

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#-*-coding:utf-8-*-
import socket
from socket import *


tgthost = input("IP: ")
tgtport = input("Port: ")
def connscan(tgthost,tgtport):
    try:
        connskt = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
        connskt.connect((tgthost,tgthost))
        connskt.send('ViolentPython\r\n')
        connskt.recv(1024)
        print('[+]%d/tcp open' % tgtport)
        print('[+] ' + str(tgthost))
    except:
        print('[-]%d/tcp closed' % tgtport)
    finally:
        connskt.close()
def portscan(tgthost,tgtport):
    try:
        tgtIP = gethostbyname(tgthost)
    except:
        print("[-] Cannot resolve ' %s ':Unknown host" %tgthost)
        return
    try:
        tgtname = gethostbyaddr(tgtIP)
        print('\n[+] Scann Results for: ' + tgtname)
    except:
        print('\n Scan Results for: ' + tgtIP)