python 循环收发 tcp 服务端与客户端脚本

以下是一个简单的 Python TCP 服务端与客户端脚本。服务端等待客户端连接并接收客户端发送的消息，然后将消息打印出来。客户端连接到服务端并发送一条消息。

### 服务端

import socket

# 创建 TCP/IP 套接字
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 绑定套接字到端口
server_address = ('localhost', 10000)
print('starting up on %s port %s' % server_address)
sock.bind(server_address)

# 开始监听传入的连接
sock.listen(1)

while True:
    # 等待连接
    print('waiting for a connection')
    connection, client_address = sock.accept()
    try:
        print('connection from', client_address)

        # 循环接收数据
        while True:
            data = connection.recv(1024)
            print('received "%s"' % data.decode())
            if data:
                connection.sendall(data)
            else:
                break

    finally:
        # 清理连接
        connection.close()

### 客户端

import socket

# 创建 TCP/IP 套接字
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 连接套接字到端口
server_address = ('localhost', 10000)
print('connecting to %s port %s' % server_address)
sock.connect(server_address)

try:
    # 发送消息
    message = 'This is a test message.'
    print('sending "%s"' % message)
    sock.sendall(message.encode())

    # 循环接收数据
    amount_received = 0
    amount_expected = len(message)
    while amount_received < amount_expected:
        data = sock.recv(1024)
        amount_received += len(data)
        print('received "%s"' % data.decode())

finally:
    # 清理连接
    sock.close()