rename_edit.py

import os

os.chdir('F:\Android\Rubel') #file directory name
for f in os.listdir():
    f_name,f_ext=os.path.splitext(f)
    f_num,f_title,f_course=f_name.split('-')
    f_title=f_title.strip()
    f_course=f_course.strip()
    f_num=f_num.strip()[1:].zfill(3)
    new_name='{} - {} - {}{}'.format(f_num,f_title,f_course,f_ext)
    print('{} - {} - {}{}'.format(f_num, f_title, f_course, f_ext))
    os.rename(f,new_name)