def add_grade():
print("请填写班级信息：")
grade_name = input("名称：")
print("选择学校：")
data.print_schools()
school_name = input("学校名：")
school = data.get_school(school_name)
if school == None:
print("学校选择错误")
return
print("选择老师：")
data.print_teachers()
teacher_name = input("老师名：")
teacher = data.get_teacher(teacher_name)
if teacher == None:
print("老师选择错误")
return
print("选择课程：")
data.print_courses()
course_name = input("课程名：")
course = data.get_course(course_name)
if course == None:
print("课程选择错误")
return
grade = school.create_grade(grade_name, teacher, course)
data.update_grade(grade)
data.update_school(school)
def modify_score():
print("选择老师：")
data.print_teachers()
teacher_name = input("老师名：")
teacher = data.get_teacher(teacher_name)
if teacher == None:
print("老师选择错误")
return
print("选择学生：")
teacher.show_students()
student_name = input("学生名：")
student = data.get_student(student_name)
if student == None:
print("学生选择错误")
return
score = input("请输入分数：")
if not score.isdigit() or 0 > int(score) or int(score) > 100:
print("输入分数不正确")
return
teacher.modify_score(student, score)
data.update_teacher(teacher)
data.update_student(student)
data.update_grade(teacher.grade)
print("%s 的成绩修改为: %s" %
(student.name, data.get_student(student_name).score))
def show_teacher():
print("选择老师：")
data.print_teachers()
teacher_name = input("老师名：")
teacher = data.get_teacher(teacher_name)
if teacher == None:
print("老师选择错误")
return
teacher.show_info()
def choose_grade():
print("选择老师：")
data.print_teachers()
teacher_name = input("老师名：")
teacher = data.get_teacher(teacher_name)
if teacher == None:
print("老师选择错误")
return
print("选择班级：")
data.print_grades()
grade_name = input("班级名：")
grade = data.get_grade(grade_name)
if grade == None:
print("班级选择错误")
return
teacher.choose_grade(grade)
data.update_teacher(teacher)