directory=os.listdir('main_folder')
for each in directory:
    plt.figure()
    currentFolder = 'main_folder/' + each
    for i, file in enumerate(os.listdir(currentFolder)[0:5]):
        fullpath = main_folder+ "/" + file
        print(fullpath)
        img=mpimg.imread(fullpath)
        plt.subplot(2, 3, i)
        plt.imshow(img)