用python写一个端口扫描工具代码

在Python中，我们可以使用`socket`模块来编写简单的端口扫描工具。这里是一个基础示例，展示了如何使用`socket`的`connect_ex()`函数来检查端口状态：

import socket

def port_scanner(target_ip, target_port):
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.settimeout(5)  # 设置超时时间，防止阻塞过久
        result = sock.connect_ex((target_ip, target_port))
        
        if result == 0:  # 如果返回值为0，表示端口是开放的
            print(f"Port {target_port} on {target_ip} is open.")
        else:
            print(f"Port {target_port} on {target_ip} is closed or not responding.")
        sock.close()
    except Exception as e:
        print(f"Error occurred: {str(e)}")

# 调用函数，例如扫描192.168.1.1的22端口
port_scanner('192.168.1.1', 22)