python用代码划分数据集为训练集和测试集（从一个文件夹中随机剪切一定比例的图片到另一文件夹中）

import os
import random
import shutil


# source_file:源路径, target_ir:目标路径
def cover_files(source_dir, target_ir):
    for file in os.listdir(source_dir):
        source_file = os.path.join(source_dir, file)

        if os.path.isfile(source_file):
            shutil.copy(source_file, target_ir)


def ensure_dir_exists(dir_name):
    """Makes sure the folder exists on disk.
  Args:
    dir_name: Path string to the folder we want to create.
  """
    if not os.path.exists(dir_name):
        os.makedirs(dir_name)


def moveFile(file_dir, save_dir):
    ensure_dir_exists(save_dir)
    path_dir = os.listdir(file_dir)  # 取图片的原始路径
    filenumber = len(path_dir)
    rate = 0.1  # 自定义抽取图片的比例，比方说100张抽10张，那就是0.1
    picknumber = int(filenumber * rate)  # 按照rate比例从文件夹中取一定数量图片
    sample = random.sample(path_dir, picknumber)  # 随机选取picknumber数量的样本图片
    # print (sample)
    for name in sample:
        shutil.move(file_dir+'/'+name, save_dir+'/'+name)


if __name__ == '__main__':
    file_dir = '/media/gpu/00758835-1a92-4611-8ae4-1518102a53d6/coding/CD-VAE-main/data/test'  # 源图片文件夹路径
    save_dir = '/media/gpu/00758835-1a92-4611-8ae4-1518102a53d6/coding/CD-VAE-main/data/testtest'  # 移动到新的文件夹路径
    moveFile(file_dir,save_dir)