Python代码运行完不输出

Question

import socket
def retBanner(ip,port):
    try:
        socket.setdefaulttimeout(0.04)
        s=socket.socket()
        s.connect((ip,port))
        ans = s.recv(1024)
        return ans
    except:
        return 

def checkVulns(ans):
    if("FreeFloat FTP Server (Version 1.00)"in ans):
     print("[+] FreeFloat FTP Server,Vulnerable")
    elif("3Com 3CDaemon FTP Server (Version 2.00)"in ans):
     print("[+] 3Com 3CDaemon FTP Server,Vulnerable")
    elif("Ability Server 2.34"in ans):
     print("[+] Ability Server,Vulnerable")
    elif("Sami FTP Server 2.0.2"in ans):
     print("[+] 3Com 3CDaemon FTP Server,Vulnerable")
    else:
     print("[+] Server is not Vulnerable | "+ans)
    return

def main():
    portList=[21,22,25,80,110,443]
    for x in range(1,225):
        ip='192.168.95.'+str(x)
        for port in portList:
            ans = retBanner(ip,port)
            if ans:
                print('[+]'+ip+':'+ans)
                checkVulns(ans)

if __name__=='__main__':
    main()

Answer 1

except里不要什么都不写，写个print，证明连接出错了
最好这样：
except Exception as e:
print(e)
这样你才能知道到底报了什么错误