将下列代码改为python：try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown();

下面是将 Java 代码转换为 Python 代码后的结果：

import socket

def check_udp_port(finalPort, portList, latch):
    try:
        dsocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        dsocket.bind(('', finalPort))
        dsocket.close()
    except socket.error:
        portList.append(finalPort)
        print(f"UDP端口{finalPort}开放")
    finally:
        latch.countDown()

在 Python 中，使用`socket`模块来进行套接字编程，`socket.socket()`函数可以创建一个套接字对象，第一个参数指定地址族，第二个参数指定套接字类型。在此代码中，我们使用`AF_INET`表示地址族为 IPv4，使用`SOCK_DGRAM`表示套接字类型为 UDP。然后使用`bind()`方法绑定端口号和 IP 地址，与 Java 中的`DatagramSocket`类的`bind()`方法类似。如果端口号已经被占用，则会抛出`socket.error`异常。最后使用`countDown()`方法通知主线程一个线程已经完成。

相关问题

将下列java代码改为python代码：blic static void scan(String host, int startPort, int endPort) throws InterruptedException { List<Integer> portList = new ArrayList<>(); final CountDownLatch latch = new CountDownLatch(endPort - startPort + 1); for (int port = startPort; port <= endPort; port++) { int finalPort = port; Thread thread = new Thread(new Runnable() { @Override public void run() { try { Socket socket = new Socket(); socket.connect(new InetSocketAddress(host, finalPort), 100); System.out.println("TCP端口" + finalPort + "开放"); portList.add(finalPort); } catch (Exception e) { } try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown(); } }); thread.start(); } latch.await(); portList.sort(new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o1.compareTo(o2); } }); }

由于Python是一种解释型语言，因此需要使用不同的模块和语言结构来实现相同的功能。以下是一个类似的Python代码：

import socket
import threading

def scan(host, startPort, endPort):
portList = []
lock = threading.Lock()

def checkPort(port):
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(0.1)
result = sock.connect((host, port))
with lock:
portList.append(port)
print("TCP端口" + str(port) + "开放")
sock.close()
except:
pass

try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(0.1)
sock.bind((host, port))
with lock:
portList.append(port)
print("UDP端口" + str(port) + "开放")
sock.close()
except:
pass

threads = []
for port in range(startPort, endPort+1):
t = threading.Thread(target=checkPort, args=(port,))
threads.append(t)
t.start()

for t in threads:
t.join()

portList.sort()
return portList

# 示例
if __name__ == "__main__":
host = "127.0.0.1"
startPort = 1
endPort = 65535
openPorts = scan(host, startPort, endPort)
print(openPorts)

将下列代码改为python代码：import java.util.ArrayList; import java.util.Comparator; import java.util.List; import java.util.concurrent.CountDownLatch; import java.net.*; public class Scanport { public static void main(String[] args) throws InterruptedException { String host = "120.46.209.149"; int startPort = 1; int endPort = 1024; int start = 0; int end = 0; int step = Math.round(endPort / 1000) + 1;// 四舍五入函数 for (int i = 1; i < step; i++) { start = startPort + (i - 1) * 1000; end = startPort + i * 1000; System.out.println("正在扫描" + start + "-" + end); scan(host, start, end); } } public static void scan(String host, int startPort, int endPort) throws InterruptedException { List<Integer> portList = new ArrayList<>(); final CountDownLatch latch = new CountDownLatch(endPort - startPort + 1); for (int port = startPort; port <= endPort; port++) { int finalPort = port; Thread thread = new Thread(new Runnable() { @Override public void run() { try { Socket socket = new Socket(); socket.connect(new InetSocketAddress(host, finalPort), 100); System.out.println("TCP端口" + finalPort + "开放"); portList.add(finalPort); } catch (Exception e) { } try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown(); } }); thread.start(); } latch.await(); portList.sort(new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o1.compareTo(o2); } }); } }

这是一个Java程序，需要转换为Python语言，转换后的代码如下：

import threading
import socket

def scan(host, startPort, endPort):
    portList = []
    for port in range(startPort, endPort+1):
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.settimeout(0.1)
            sock.connect((host, port))
            print("TCP端口{}开放".format(port))
            portList.append(port)
            sock.close()
        except:
            pass
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            sock.settimeout(0.1)
            sock.bind((host, port))
            print("UDP端口{}开放".format(port))
            portList.append(port)
            sock.close()
        except:
            pass

    portList.sort()
    print(portList)

if __name__ == '__main__':
    host = "120.46.209.149"
    startPort = 1
    endPort = 1024
    step = (endPort // 1000) + 1

    for i in range(1, step):
        start = startPort + (i - 1) * 1000
        end = startPort + i * 1000
        print("正在扫描{}-{}".format(start, end))
        scan(host, start, end)