def show_student():
print("选择学生：")
data.print_students()
student_name = input("学生名：")
student = data.get_student(student_name)
if student == None:
print("学生选择错误")
return
student.show_info()
def pay_tuition():
print("选择学生：")
data.print_students()
student_name = input("学生名：")
student = data.get_student(student_name)
if student == None:
print("学生选择错误")
return
money = input("请输入学费金额：")
if not money.isdigit():
print("输入金额不正确")
return
student.pay_tuition(int(money))
data.update_student(student)
def choose_school():
print("选择学生：")
data.print_students()
student_name = input("学生名：")
student = data.get_student(student_name)
if student == None:
print("学生选择错误")
return
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
student.choose_school(school)
data.update_student(student)
data.update_school(school)
def choose_grade():
print("选择学生：")
data.print_students()
student_name = input("学生名：")
student = data.get_student(student_name)
if student == None:
print("学生选择错误")
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
student.choose_grade(grade)
data.update_student(student)
data.update_grade(grade)
def show_students():
data.print_students()
