如何在Python中创建ramdisk？

import os
import subprocess

def create_ramdisk(size, mount_point):
    # 创建ramdisk
    subprocess.run(['sudo', 'mkdir', mount_point])
    subprocess.run(['sudo', 'mount', '-t', 'tmpfs', '-o', 'size=' + size, 'tmpfs', mount_point])

    # 设置权限
    subprocess.run(['sudo', 'chmod', '777', mount_point])

    # 在ramdisk中创建文件
    file_path = os.path.join(mount_point, 'test.txt')
    with open(file_path, 'w') as f:
        f.write('This is a test file in ramdisk.')

    print('Ramdisk created successfully.')

# 设置ramdisk的大小和挂载点
ramdisk_size = '1G'
ramdisk_mount_point = '/mnt/ramdisk'

# 创建ramdisk
create_ramdisk(ramdisk_size, ramdisk_mount_point)