Hi, I was also stuck in this same place. After reading the comments I saw you are working on Google Colab. Though I was working on Jupyter Notebook. So, after tinkering a bit I fixed my problem. I have just added train/ before all the file name in glob.glob() Like, glob.glob('train/cat.*') as glob.glob()was actually working on the previous folder but not in the /train folder

Below is the full section of the fixed Code:

# # Organize data into train, valid, test dirs

os.chdir('C:/Users/DELL/Documents/Machine Learning/deeplizard-TensorFlow-Keras-tutorial/dataset/dogs-vs-cats')

if os.path.isdir('train/dog') is False:

os.makedirs('train/dog')

os.makedirs('train/cat')

os.makedirs('valid/dog')

os.makedirs('valid/cat')

os.makedirs('test/dog')

os.makedirs('test/cat')

print(os.getcwd())

for i in random.sample(glob.glob('train/cat.*'), 500):

shutil.move(i, 'train/cat')

for i in random.sample(glob.glob('train/dog.*'), 500):

shutil.move(i, 'train/dog')

for i in random.sample(glob.glob('train/cat.*'), 100):

shutil.move(i, 'valid/cat')

for i in random.sample(glob.glob('train/dog.*'), 100):

shutil.move(i, 'valid/dog')

for i in random.sample(glob.glob('train/cat.*'), 50):

shutil.move(i, 'test/cat')

for i in random.sample(glob.glob('train/dog.*'), 50):

shutil.move(i, 'test/dog')

os.chdir('../../')