def del_nbgrader_user(user, course):
print(f"del {user} from course {course}")
home = get_home_dir(f"grader-{course}")
course_dir = f"{home}/{course}"
gradebook = Gradebook(f"sqlite:///{course_dir}/gradebook.db",
course_id=course)
gradebook.remove_student(user)
gradebook.close()
for subdir in ("autograded", "feedback", "submitted"):
os.system(f"rm -rf {course_dir}/{subdir}/{user}")
