python读取图片

from torch.utils.data import Dataset
from PIL import Image
import os

class MyData(Dataset):

    def __init__(self, root_dir, label_dir):
        self.root_dir = root_dir
        self.label_dir = label_dir
        self.path = os.path.join(self.root_dir, self.label_dir)
        self.img_path = os.listdir(self.path)

    def __getitem__(self, idx):
        img_name = self.img_path[idx]
        img_item_path = os.path.join(self.root_dir, self.label_dir, img_name)
        img = Image.open(img_item_path)
        label = self.label_dir
        return  img, label
    def __len__(self):
        return len(self.img_path)

root_dir = "dataset/train"
target_dir = "ants"
img_path = os.listdir(os.path.join(root_dir, target_dir))
label = target_dir.split('_')[0]
out_dir = "ants_label"
for i in img_path:
    file_name = i.split('.jpg')[0]
    with open(os.path.join(root_dir, out_dir, "{}.txt".format(file_name)), 'w') as f:
        f.write(label)