python编写一个脚本，实现远程控制功能：命令执行、文件上传和文件下载

实现远程控制功能需要先建立服务器和客户端之间的连接，可以使用Python的socket模块实现。下面是一个简单的脚本示例，实现了命令执行、文件上传和文件下载三项功能。

服务端代码：

import socket
import subprocess
import os

SERVER_HOST = '0.0.0.0'
SERVER_PORT = 9999
BUFFER_SIZE = 4096

def execute_command(command):
    try:
        output = subprocess.check_output(command, shell=True)
    except Exception as e:
        output = str(e).encode()
    return output

def send_file(conn, file_path):
    with open(file_path, 'rb') as f:
        data = f.read(BUFFER_SIZE)
        while data:
            conn.send(data)
            data = f.read(BUFFER_SIZE)

def receive_file(conn, file_path):
    with open(file_path, 'wb') as f:
        data = conn.recv(BUFFER_SIZE)
        while data:
            f.write(data)
            data = conn.recv(BUFFER_SIZE)

def handle_connection(conn, addr):
    print(f'[*] New connection from {addr[0]}:{addr[1]}')
    while True:
        data = conn.recv(BUFFER_SIZE)
        if not data:
            break
        command = data.decode().strip()
        if command.startswith('cd'):
            os.chdir(command[3:])
            output = b''
        elif command.startswith('upload'):
            file_path = command[7:]
            receive_file(conn, file_path)
            output = b'File uploaded successfully'
        elif command.startswith('download'):
            file_path = command[9:]
            send_file(conn, file_path)
            output = b''
        else:
            output = execute_command(command)
        conn.send(output)
    conn.close()

def main():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind((SERVER_HOST, SERVER_PORT))
    s.listen(5)
    print(f'[*] Listening on {SERVER_HOST}:{SERVER_PORT}')
    while True:
        conn, addr = s.accept()
        handle_connection(conn, addr)

if __name__ == '__main__':
    main()

客户端代码：

import socket
import os

SERVER_HOST = '127.0.0.1'
SERVER_PORT = 9999
BUFFER_SIZE = 4096

def execute_command(command):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((SERVER_HOST, SERVER_PORT))
    s.send(command.encode())
    output = b''
    data = s.recv(BUFFER_SIZE)
    while data:
        output += data
        data = s.recv(BUFFER_SIZE)
    s.close()
    return output.decode()

def send_file(file_path):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((SERVER_HOST, SERVER_PORT))
    s.send(f'upload {file_path}'.encode())
    with open(file_path, 'rb') as f:
        data = f.read(BUFFER_SIZE)
        while data:
            s.send(data)
            data = f.read(BUFFER_SIZE)
    s.close()

def receive_file(file_path):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((SERVER_HOST, SERVER_PORT))
    s.send(f'download {file_path}'.encode())
    with open(file_path, 'wb') as f:
        data = s.recv(BUFFER_SIZE)
        while data:
            f.write(data)
            data = s.recv(BUFFER_SIZE)
    s.close()

def main():
    while True:
        command = input('> ')
        if command == 'exit':
            break
        elif command.startswith('upload'):
            file_path = command[7:]
            if os.path.exists(file_path):
                send_file(file_path)
                print('File uploaded successfully')
            else:
                print(f'{file_path} does not exist')
        elif command.startswith('download'):
            file_path = command[9:]
            receive_file(file_path)
            print('File downloaded successfully')
        else:
            output = execute_command(command)
            print(output)

if __name__ == '__main__':
    main()

使用方法：

1. 在服务端计算机上运行服务端脚本
2. 在客户端计算机上运行客户端脚本，并输入服务端计算机的IP地址和端口号
3. 在客户端上输入命令，可以执行远程命令、上传文件和下载文件。例如，执行`ls`命令，上传`test.txt`文件，下载`example.txt`文件等。