文件夹中有很多张图片，随机取出80%张图片放在train文件中，抽取10%放在val文件中，剩下10%放到test文件中，要完成这一步python程序怎么写

在Python中，你可以使用`random`模块和一些基本的文件操作来实现这个任务。这里是一个简单的示例：

import os
import random

# 假设图片目录是images_folder
image_folder = 'images_folder'
train_ratio = 0.8
val_ratio = 0.1
test_ratio = 0.1

# 检查图像文件夹是否存在
if not os.path.exists(image_folder):
    print(f"Folder {image_folder} does not exist.")
else:
    # 获取所有图片文件列表
    all_images = [f for f in os.listdir(image_folder) if os.path.isfile(os.path.join(image_folder, f)) and f.endswith(('.jpg', '.png', '.jpeg'))]

    # 计算划分比例
    total_files = len(all_images)
    train_count = int(train_ratio * total_files)
    val_count = int(val_ratio * total_files)

    # 验证总和是否合理
    assert train_count + val_count + test_ratio * total_files == total_files, "Sum of ratios exceeds 1"

    # 打乱图片顺序
    random.shuffle(all_images)

    # 分割并保存到对应的文件夹
    train_path = 'train'
    val_path = 'val'
    test_path = 'test'

    os.makedirs(train_path, exist_ok=True)
    os.makedirs(val_path, exist_ok=True)
    os.makedirs(test_path, exist_ok=True)

    for i, img_name in enumerate(all_images[:train_count]):
        src = os.path.join(image_folder, img_name)
        dst = os.path.join(train_path, img_name)
        shutil.move(src, dst)

    for i, img_name in enumerate(all_images[train_count : train_count + val_count]):
        src = os.path.join(image_folder, img_name)
        dst = os.path.join(val_path, img_name)
        shutil.move(src, dst)

    for i, img_name in enumerate(all_images[train_count + val_count :]):
        src = os.path.join(image_folder, img_name)
        dst = os.path.join(test_path, img_name)
        shutil.move(src, dst)

    print("Images have been randomly split into train, val, and test folders.")