I’m listing images with these code:

for folder in folder_list:
    img = os.path.join(f"{train_dir}/{folder}/00001.png")
    print(img)

output is:

Fish/train/Black Sea Sprat/00001.png /Fish/train/Gilt-Head
Bream/00001.png Fish/train/Hourse Mackerel/00001.png Fish/train/Red
Mullet/00001.png /Fish/train/Red Sea Bream/00001.png Fish/train/Sea
Bass/00001.png Fish/train/Shrimp/00001.png /Fish/train/Striped Red
Mullet/00001.png Downloads/Fish/train/Trout/00001.
there is 9 pictures.

>Solution :

You are just printing image file names. You need to enumerate the list of images and plot one by one using plt.sublot

import os
import matplotlib.pyplot as plt
import PIL
files=[] #empty list
rows = 3 #Number of rows u need

for folder in folder_list:
    img = os.path.join(f"{train_dir}/{folder}/00001.png")
    files.append(img)
   
for num, x in enumerate(files):
    img = PIL.Image.open(x)
    plt.subplot(rows,6,num+1)
    plt.title(x.split('.')[0])
    plt.axis('off')
    plt.imshow(img)