import os
directory = 'C:/Users/Kuban/Desktop/PYTHON_folder'

number_of_files = len([item for item in os.listdir(directory) if os.path.isfile(os.path.join(directory, item))])
print(number_of_files)

files = []
for r,d,f in os.walk(directory):
    for file in f:
            files.append(os.path.join(r, file))

for f in files:
    print(f)