Exemple #1
0
 def view_classroom(self, class_id):
     sc_table = DatabasesCls("student_classroom")
     classroom_table = DatabasesCls("classroom")
     course_table = DatabasesCls("courses")
     school_table = DatabasesCls("schools")
     school_data = school_table.open()
     sc_data = sc_table.open()
     classroom_data = classroom_table.open()
     course_data = course_table.open()
     if class_id in sc_data:
         while True:
             print("_" * 100)
             print("班级ID\t\t学生ID\t\t\t讲师ID\t\t\t班级名称\t\t\t\t课程名称\t\t学校")
             print("-" * 100)
             student_list = sc_data[class_id]
             for student in student_list:
                 teacher_id = classroom_data[class_id]["teacher_id"]
                 class_name = classroom_data[class_id]["class_name"]
                 course_id = classroom_data[class_id]["course_id"]
                 course_name = course_data[course_id]["name"]
                 school_id = classroom_data[class_id]["school_id"]
                 school_name = school_data[school_id]["name"]
                 print("%s\t\t%s\t\t\t%s\t\t\t%s\t\t\t%s\t\t%s" % \
                       (class_id,student,teacher_id,class_name,course_name,school_name))
             print("-" * 100)
             choice = input("[B|b返回]: ")
             if choice == "B" or choice == "b":
                 break
     else:
         print("该班级还没有学员!!")
         time.sleep(1)
Exemple #2
0
 def student_list(self):
     print("学员列表--")
     student_pc_table = DatabasesCls("student_purchase_course")
     course_table = DatabasesCls("courses")
     data = student_pc_table.open()
     course_data = course_table.open()
     print(data)
     while True:
         print("_" * 100)
         print("学员ID\t\t\t购买的课程\t\t\t课程名称\t\t\t购买时间\t\t\t\t\t班级关联状态")
         print("-" * 100)
         for k, v in data.items():
             for i, j in v.items():
                 student_id = k
                 course_id = i
                 course_name = course_data[course_id]["name"]
                 purchase_time = j["purchase_time"]
                 status = j["status"]
                 status_com = ""
                 if status == 0:
                     status_com = "未关联"
                 elif status == 1:
                     status_com = "已关联"
                 print("%s\t\t\t%s\t\t\t\t\t%s\t\t\t%s\t\t\t%s" %
                       (student_id, course_id, course_name, purchase_time,
                        status_com))
         print("-" * 100)
         choice = input("请输入选项[A关联班级|B|b返回]: ").strip()
         if choice == "B" or choice == "b":
             break
         elif choice == "A" or choice == "a":
             Admin.join_student(self)
Exemple #3
0
    def classroom_list(self):
        classroom_data = ClassroomStaticCls.classroom_table.open()
        course_data = CourseStaticCls.course_table.open()
        teacher_data = TeacherStaticCls.teacher_table.open()
        school_data = SchoolStaticCls.school_table.open()
        sc_table = DatabasesCls("student_classroom")
        sc_data = sc_table.open()
        print(sc_data)
        while True:
            print("_" * 130)
            print("-" * 130)
            for k, v in classroom_data.items():
                class_id, class_name, course_id, school_id, teacher_id = \
                    k, v["class_name"], v["course_id"], v["school_id"], v["teacher_id"]
                course_name = course_data[course_id]["name"]
                school_name = school_data[school_id]["name"]
                teacher_name = teacher_data[teacher_id]["name"]

                count = len(sc_data[class_id])
                print("班级ID: %s\t\t班级名字: %s\t\t课程ID: %s\t\t课程名字: %s\t\t所在学校: %s\t\t授课讲师: %s\t\t学生人数: %s" % \
                      (class_id, class_name, course_id, course_name, school_name, teacher_name,count))
            print("-" * 130)
            choice = input("输入班级ID查看班级学员(B返回): ")
            if choice == "B" or choice == "b":
                break
            School.view_classroom(self, choice)
Exemple #4
0
 def update(self):
     school_table = DatabasesCls("schools")
     school_list = school_table.open()
     data = self.teacher_table.open()
     if self.id in data and self.id.isalnum():
         if self.password != "" and self.name != "" and self.phone != "" and self.teacher_title \
                 != "" and self.teacher_salary != "":
             if self.teacher_school in school_list:
                 try:
                     self.teacher_obj["password"] = self.password
                     self.teacher_obj["name"] = self.name
                     self.teacher_obj["phone"] = self.phone
                     self.teacher_obj["school_id"] = self.teacher_school
                     self.teacher_obj["title"] = self.teacher_title
                     self.teacher_obj["salary"] = self.teacher_salary
                     self.teacher_obj["email"] = self.teacher_email
                     data[self.id] = self.teacher_obj
                     self.teacher_table.save(data)
                     return 0  #保存成功
                 except BaseException:
                     return 3  #保存失败
             else:
                 return 3  #学校代码不存在
         else:
             return 2  #账号密码、名字、手机、职务、薪资不能为空
     else:
         return 1  #讲师账号已存在或输入错误
 def my_course(self):
     print("我的课程--")
     user_name = user_data["user_id"]
     sc_table = DatabasesCls("student_classroom")
     cr_table = DatabasesCls("classroom")
     courses_table = DatabasesCls("courses")
     spc_table = DatabasesCls("student_purchase_course")
     spc_data = spc_table.open()
     courses_data = courses_table.open()
     sc_data = sc_table.open()
     cr_data = cr_table.open()
     print(sc_data)
     print(cr_data)
     print(courses_data)
     print(spc_data)
     while True:
         print("_" * 50)
         print("课程ID\t\t\t课程名称\t\t\t课程大纲")
         print("-" * 50)
         course_dict = spc_data[user_name]
         for id, value in course_dict.items():
             course_id = id
             course_name = courses_data[course_id]["name"]
             course_outline = courses_data[course_id]["outline"]
             print("%s\t\t\t\t%s\t\t\t%s" %
                   (course_id, course_name, course_outline))
         print("-" * 50)
         choice = input("选择课程ID进入学习[B返回]: ")
         print(course_dict)
         if choice == "B" or choice == "b":
             break
         try:
             choice = int(choice)
         except:
             pass
         if choice in course_dict:
             course = courses_data[choice]["name"]
             try:
                 course_dict[choice]["count"] += 1
             except:
                 course_dict[choice]["count"] = 0
             finally:
                 spc_data[user_name] = course_dict
                 spc_table.save(spc_data)
                 print("正在学习课程%s, 已学习%s次..." %
                       (course, course_dict[choice]["count"]))
                 time.sleep(1)
Exemple #6
0
    def join_student(self):
        student_table = DatabasesCls("students")
        classroom_table = DatabasesCls("classroom")
        student_classroom = DatabasesCls("student_classroom")
        student_pc_table = DatabasesCls("student_purchase_course")
        student_data = student_table.open()
        classroom_data = classroom_table.open()
        sc_data = student_classroom.open()
        pc_data = student_pc_table.open()
        print("关联班级--")
        print("/" * 15 + "学员关联班级 (*选项为必填)" + "/" * 15)
        student_id = input("*请输入学员的ID: ").strip()
        student_class_id = input("*请输入该学员关联的班级ID: ").strip()
        print(sc_data)
        if student_id in student_data:
            if student_id in pc_data:
                if student_class_id in classroom_data:
                    try:
                        s_list = sc_data[student_class_id]
                    except:
                        s_list = []

                    if student_id not in s_list:
                        s_list.append(student_id)
                        print(s_list)
                        sc_data[student_class_id] = s_list
                        student_classroom.save(sc_data)

                        course_id = classroom_data[student_class_id][
                            "course_id"]
                        pc_data[student_id][course_id]["status"] = 1
                        student_pc_table.save(pc_data)
                        print("关联成功!")
                        time.sleep(1)

                    else:
                        print("学员%s已经关联到该班级." % student_id)
                    print(sc_data)
                else:
                    print("班级ID不存在!!")
            else:
                print("该学员未购买该课程!!")
        else:
            print("学员ID不存在!!")
Exemple #7
0
 def update(self):
     school_table = DatabasesCls("schools")
     course_table = DatabasesCls("courses")
     teacher_table = DatabasesCls("teachers")
     class_data = self.classroom_table.open()
     course_data = course_table.open()
     school_data = school_table.open()
     teacher_data = teacher_table.open()
     if self.class_id in class_data:
         if self.class_name != "":
             if self.course_id in course_data:
                 if self.school_id in school_data:
                     if self.teacher_id in teacher_data:
                         try:
                             enroll_date = time.strftime(
                                 "%Y-%m-%d %H:%M:%S", time.localtime())
                             self.classroom_obj[
                                 "class_name"] = self.class_name
                             self.classroom_obj[
                                 "course_id"] = self.course_id
                             self.classroom_obj[
                                 "teacher_id"] = self.teacher_id
                             self.classroom_obj[
                                 "school_id"] = self.school_id
                             self.classroom_obj["enroll_date"] = str(
                                 enroll_date)
                             class_data[self.class_id] = self.classroom_obj
                             self.classroom_table.save(class_data)
                             return 0  # 保存成功
                         except BaseException:
                             return 1  # 保存失败
                     else:
                         return 2  # 讲师ID不存在
                 else:
                     return 6  # 学校不存在
             else:
                 return 3  # 课程ID不存在
         else:
             return 4  # 班级名字为空
     else:
         return 5  # 班级ID不存在
 def view_grade(self):
     print("查询成绩--")
     user_name = user_data["user_id"]
     spc_table = DatabasesCls("student_purchase_course")
     courses_table = DatabasesCls("courses")
     spc_data = spc_table.open()
     course_data = courses_table.open()
     while True:
         print("_" * 50)
         print("课程ID\t\t\t课程名称\t\t\t学习成绩")
         print("-" * 50)
         course_dict = spc_data[user_name]
         for course_id, value in course_dict.items():
             course_name = course_data[course_id]["name"]
             study_grade = value["grade"]
             print("%s\t\t\t\t%s\t\t\t%s分" %
                   (course_id, course_name, study_grade))
         print("-" * 50)
         choice = input("[B|b返回]: ")
         if choice == "B" or choice == "b":
             break
 def my_classroom(self):
     print("我的班级--")
     user_name = user_data["user_id"]
     sc_table = DatabasesCls("student_classroom")
     cr_table = DatabasesCls("classroom")
     sc_data = sc_table.open()
     cr_data = cr_table.open()
     while True:
         print("_" * 50)
         print("班级ID\t\t\t班级名称\t\t\t\t讲师")
         print("-" * 50)
         print(sc_data)
         for class_id, student_list in sc_data.items():
             if user_name in student_list:
                 class_name = cr_data[class_id]["class_name"]
                 teacher = cr_data[class_id]["teacher_id"]
                 print("%s\t\t\t%s\t\t\t%s" %
                       (class_id, class_name, teacher))
         print("-" * 50)
         choice = input("[B|b返回]: ")
         if choice == "B" or choice == "b":
             break
Exemple #10
0
 def study_record(self):
     print("上课记录--")
     user_name = user_data["user_id"]
     spc_table = DatabasesCls("student_purchase_course")
     courses_table = DatabasesCls("courses")
     spc_data = spc_table.open()
     course_data = courses_table.open()
     while True:
         print("_" * 50)
         print("课程ID\t\t\t课程名称\t\t\t学习次数")
         print("-" * 50)
         course_dict = spc_data[user_name]
         for course_id, value in course_dict.items():
             course_name = course_data[course_id]["name"]
             try:
                 study_count = value["count"]
             except:
                 study_count = 0
             print("%s\t\t\t\t%s\t\t\t%s" %
                   (course_id, course_name, study_count))
         print("-" * 50)
         choice = input("[B|b返回]: ")
         if choice == "B" or choice == "b":
             break
Exemple #11
0
    def create_classroom(self):

        print("/" * 15 + "创建班级 (*选项为必填)" + "/" * 15)
        class_id = input("*输入要创建的班级ID(如:1801): ").strip()
        class_name = input("*输入要创建的班级名字: ").strip()
        course_id = input("*输入该班级开设(关联)的课程ID: ").strip()
        school_id = input("*输入该班级所在的学校ID: ").strip()
        teacher_id = input("*输入该班级的授课(关联)讲师的ID帐号: ").strip()
        try:
            course_id = int(course_id)
        except ValueError:
            pass
        classroom = ClassroomStaticCls(class_id, class_name, course_id,
                                       school_id, teacher_id)  # 初始化 对象中的数据
        new_classroom = classroom.create()  # 在初始化数据后 调用 create方法
        #==============================================
        # 增加一个为空的班级对应学生的信息的存放着
        sc_table = DatabasesCls("student_classroom")
        sc_data = sc_table.open()  #读取学生班级信息
        sc_data[class_id] = []
        sc_table.save(sc_data)

        if new_classroom == 0:
            print("创建成功!")
        elif new_classroom == 1:
            print("创建失败! 无法保存.")
        elif new_classroom == 2:
            print("讲师不存在或讲师ID错误!")
        elif new_classroom == 3:
            print("课程不存在或课程ID错误!")
        elif new_classroom == 4:
            print("班级名字不能为空!")
        elif new_classroom == 5:
            print("班级ID已存在!")
        elif new_classroom == 6:
            print("学校不存在!")
        else:
            print("创建失败!")
        print(classroom.classroom_obj)
Exemple #12
0
    def view_classroom(self, teacher_id):
        print("查看班级学员--")
        cr_table = DatabasesCls("classroom")
        sc_table = DatabasesCls("student_classroom")
        course_table = DatabasesCls("courses")
        spc_table = DatabasesCls("student_purchase_course")
        cr_data = cr_table.open()
        sc_data = sc_table.open()
        course_data = course_table.open()
        spc_data = spc_table.open()
        classes = []
        while True:
            print("_" * 120)
            print(
                "班级ID\t\t班级名称\t\t\t\t讲师ID\t\t\t课程ID\t\t课程名称\t\t\t学校ID\t\t班级人数\t\t\t创建时间"
            )
            print("-" * 120)
            for class_id, class_value in cr_data.items():
                teacher = class_value["teacher_id"]
                if teacher == teacher_id:
                    classes.append(class_id)
                    class_name = class_value["class_name"]
                    course_id = class_value["course_id"]
                    course_name = course_data[course_id]["name"]
                    school_id = class_value["school_id"]
                    count = len(sc_data[class_id])
                    enroll_date = class_value["enroll_date"]
                    print("%s\t\t%s\t\t\t%s\t\t\t%s\t\t\t%s\t\t\t%s\t\t\t\t%s\t\t\t%s" % \
                          (class_id,class_name,teacher,course_id,course_name,school_id,count,enroll_date))
            print("-" * 120)
            choice = input("输入选项: \n"
                           "1 查看学员\n"
                           "2 开始上课\n"
                           "3 返回\n"
                           "Enter your choice: ")
            if choice == "3":
                break
            if choice == "1":
                print("查看班级学员--")
                class_id2 = input("请输入班级ID: ")
                if class_id2 in classes:
                    while True:
                        print("_" * 80)
                        print("班级ID\t\t学生ID\t\t\t课程名称\t\t\t学习次数\t\t\t成绩")
                        print("-" * 80)
                        student_list = sc_data[class_id2]
                        if class_id2 in cr_data:

                            course_id = cr_data[class_id2]["course_id"]
                            course_name = course_data[course_id]["name"]

                            for student_id in student_list:
                                if student_id in spc_data:
                                    study_count = spc_data[student_id][
                                        course_id]["count"]
                                    study_grade = spc_data[student_id][
                                        course_id]["grade"]
                                    print(
                                        "%s\t\t%s\t\t\t%s\t\t\t%s\t\t\t\t%s" %
                                        (class_id2, student_id, course_name,
                                         study_count, study_grade))
                            print("-" * 80)
                            choice = input("输入选项: \n"
                                           "1 修改学员成绩\n"
                                           "2 返回\n"
                                           "Enter your choice: ")
                            if choice == "2":
                                return
                            if choice == "1":
                                print("修改学员成绩--")
                                student = input("输入学员ID: ")
                                grade = input("输入学员成绩: ")
                                if student in student_list:
                                    if grade.isdigit():
                                        spc_data[student][course_id][
                                            "grade"] = grade
                                        spc_table.save(spc_data)
                                        print(spc_data)
                                        print("修改成功!")
                                        time.sleep(1)
                                    else:
                                        print("成绩格式错误!")
                                else:
                                    print("学员不存在!")
                else:
                    print("班级ID不存在!")
            if choice == "2":
                print("选择班级上课--")
                class_id3 = input("请输入班级ID: ")
                if class_id3 in classes:
                    print("开始上课----")
                    time.sleep(1)
                else:
                    print("班级ID不存在!")
Exemple #13
0
class StudentsAccountCls(object):
    def __init__(self, cookie):
        super(StudentsAccountCls, self).__init__()
        self.cookie = cookie
        self.user_table = DatabasesCls("students")

    @staticmethod
    def login_required(func):  # 用户登录装饰器
        def wrapper(*args, **kwargs):
            cookie = user_data
            if cookie['is_authenticated']:
                return func(*args, **kwargs)
            else:
                print("帐号未登录验证!")

        return wrapper

    def set_session(self, user, account_data):
        try:
            self.cookie['user_id'] = user
            self.cookie['is_authenticated'] = True
            self.cookie['user_data'] = account_data
            return True
        except:
            pass

    def clear_session(self, user_data):
        try:
            user_data['user_id'] = None
            user_data['is_authenticated'] = False
            user_data['user_data'] = None
            return True
        except:
            pass

    def logout(self):
        StudentsAccountCls.clear_session(self, self.cookie)

    def login(self):
        print(self.cookie)
        accounts_dict = self.user_table.open()
        retry_count = 0
        while retry_count < 3:
            username = input("Username: "******"Password: "******"" and password != "":
                if username in accounts_dict:
                    user_pass = accounts_dict[username]["password"]
                    if password == user_pass:
                        print("验证成功!")
                        account_data = accounts_dict[username]
                        StudentsAccountCls.set_session(self, username,
                                                       account_data)
                        return self.cookie
                    else:
                        print("帐号或密码错误!")
                        retry_count += 1
                else:
                    print("该用户名未注册!")
            else:
                print("帐号或密码不能为空!")
                retry_count += 1

    def forgot(self):
        accounts_dict = self.user_table.open()
        print("----重置密码----")
        retry_count = 0
        while retry_count < 3:
            username = input("请输入你的用户名: ")
            if username in accounts_dict:
                password = input("请输入新密码(3-18位字符): ")
                if password != "" and len(password) >= 3 and len(
                        password) <= 18:
                    password2 = input("再次输入新密码: ")
                    if password2 == password:
                        accounts_dict[username]["password"] = password2
                        self.user_table.save(accounts_dict)
                        print("修改成功.")
                        break
                    else:
                        print("两次输入密码不匹配.")
                        retry_count += 1
                else:
                    print("密码不符合要求!")
                    retry_count += 1
            else:
                print("该用户不存在!")

    def registered(self):
        print("----注册帐号----")
        print("/" * 15 + "注册帐号 (*选项必填)" + "/" * 15)
        accounts_dict = self.user_table.open()
        while True:
            username = input("*输入您要注册的用户名: ").strip()
            password = input("*输入您要设置的密码(3-12位字符): ").strip()
            password2 = input("*再次输入新密码: ").strip()
            real_name = input("*输入您的姓名: ")
            gender = input("*输入您的性别: ").strip()
            dob = input("*输入您的出生年月日(0000-00-00): ").strip()
            phone = input("*请输入11位数字的手机号码(如:13100224466): ").strip()
            email = input("*输入您的电子邮箱: ").strip()

            if username.isalnum() and username not in accounts_dict:
                if password != "":
                    if password == password2:
                        if gender != "" and dob != "" and phone != "" and email != "" and real_name != "":
                            dict = {}
                            student_id = 10000 + len(accounts_dict) + 1
                            enroll_date = time.strftime(
                                "%Y-%m-%d %H:%M:%S", time.localtime())
                            status = 0
                            dict["student_id"] = student_id
                            dict["name"] = real_name
                            dict["password"] = password
                            dict["gender"] = gender
                            dict["dob"] = dob
                            dict["phone"] = phone
                            dict["email"] = email
                            dict["enroll_date"] = enroll_date
                            dict["status"] = status
                            accounts_dict[username] = dict
                            choice = input("确定注册[Y|n]?")
                            if choice == "Y" or choice == "y":
                                self.user_table.save(accounts_dict)
                                print("注册成功!")
                                time.sleep(1)
                                break
                        else:
                            print("资料未完善!")
                            break
                    else:
                        print("两次输入密码不匹配!")
                        break
                else:
                    print("密码不能为空!")
                    break
            else:
                print("帐号格式不正确或已存在!")
                break
Exemple #14
0
class Student(object):
    def __init__(self, name):
        super(Student, self).__init__()
        self.name = name
        self.student_purchase_course = DatabasesCls("student_purchase_course")

    def course_list(self):
        data = CourseStaticCls.course_table.open()
        purchase_dict = self.student_purchase_course.open()
        user_name = user_data["user_id"]

        while True:
            print("_" * 100)
            print("课程编号\t\t  课程名称\t\t\t课程价格\t\t\t课程周期\t\t课程大纲")
            print("-" * 100)
            for k, v in data.items():
                id, name, price, period, outline = \
                    k, v["name"], v["price"], v["period"], v["outline"]
                name = name.center(10, " ")
                print("<< %s >>\t\t%s\t\t\t%s\t\t\t%s\t\t\t%s" % \
                      (id, name, price, period, outline))
            print("-" * 100)
            choice = input("请输入课程编号进行选课购买[B返回]: ").strip()
            if choice == "B" or choice == "b":
                break
            try:
                choice = int(choice)
            except:
                pass
            if choice in data:
                enter = input("确认购买?[Y|n]")
                if enter == "Y" or enter == "y":
                    if user_name not in purchase_dict:
                        dict1 = {}
                        dict2 = {}
                        purchase_time = time.strftime("%Y-%m-%d %H:%M:%S",
                                                      time.localtime())
                        dict1["purchase_time"] = purchase_time
                        dict1["status"] = 0
                        dict1["grade"] = 0
                        dict1["count"] = 0
                        dict2[choice] = dict1
                        purchase_dict[user_name] = dict2
                        self.student_purchase_course.save(purchase_dict)
                        print("购买成功!")
                        time.sleep(1)
                    else:
                        dict1 = {}
                        dict2 = purchase_dict[user_name]
                        if choice not in purchase_dict[user_name]:
                            purchase_time = time.strftime(
                                "%Y-%m-%d %H:%M:%S", time.localtime())
                            dict1["purchase_time"] = purchase_time
                            dict1["status"] = 0
                            dict1["grade"] = 0
                            dict1["count"] = 0
                            dict2[choice] = dict1
                            purchase_dict[user_name] = dict2
                            self.student_purchase_course.save(purchase_dict)
                            print("购买成功!")
                            time.sleep(1)
                        else:
                            print("您已购买该课程, 快开始学习吧!")
                else:
                    print("取消购买.")
            else:
                print("课程ID不存在!")

    def my_course(self):
        print("我的课程--")
        user_name = user_data["user_id"]
        sc_table = DatabasesCls("student_classroom")
        cr_table = DatabasesCls("classroom")
        courses_table = DatabasesCls("courses")
        spc_table = DatabasesCls("student_purchase_course")
        spc_data = spc_table.open()
        courses_data = courses_table.open()
        sc_data = sc_table.open()
        cr_data = cr_table.open()
        print(sc_data)
        print(cr_data)
        print(courses_data)
        print(spc_data)
        while True:
            print("_" * 50)
            print("课程ID\t\t\t课程名称\t\t\t课程大纲")
            print("-" * 50)
            course_dict = spc_data[user_name]
            for id, value in course_dict.items():
                course_id = id
                course_name = courses_data[course_id]["name"]
                course_outline = courses_data[course_id]["outline"]
                print("%s\t\t\t\t%s\t\t\t%s" %
                      (course_id, course_name, course_outline))
            print("-" * 50)
            choice = input("选择课程ID进入学习[B返回]: ")
            print(course_dict)
            if choice == "B" or choice == "b":
                break
            try:
                choice = int(choice)
            except:
                pass
            if choice in course_dict:
                course = courses_data[choice]["name"]
                try:
                    course_dict[choice]["count"] += 1
                except:
                    course_dict[choice]["count"] = 0
                finally:
                    spc_data[user_name] = course_dict
                    spc_table.save(spc_data)
                    print("正在学习课程%s, 已学习%s次..." %
                          (course, course_dict[choice]["count"]))
                    time.sleep(1)

    def my_classroom(self):
        print("我的班级--")
        user_name = user_data["user_id"]
        sc_table = DatabasesCls("student_classroom")
        cr_table = DatabasesCls("classroom")
        sc_data = sc_table.open()
        cr_data = cr_table.open()
        while True:
            print("_" * 50)
            print("班级ID\t\t\t班级名称\t\t\t\t讲师")
            print("-" * 50)
            print(sc_data)
            for class_id, student_list in sc_data.items():
                if user_name in student_list:
                    class_name = cr_data[class_id]["class_name"]
                    teacher = cr_data[class_id]["teacher_id"]
                    print("%s\t\t\t%s\t\t\t%s" %
                          (class_id, class_name, teacher))
            print("-" * 50)
            choice = input("[B|b返回]: ")
            if choice == "B" or choice == "b":
                break

    def study_record(self):
        print("上课记录--")
        user_name = user_data["user_id"]
        spc_table = DatabasesCls("student_purchase_course")
        courses_table = DatabasesCls("courses")
        spc_data = spc_table.open()
        course_data = courses_table.open()
        while True:
            print("_" * 50)
            print("课程ID\t\t\t课程名称\t\t\t学习次数")
            print("-" * 50)
            course_dict = spc_data[user_name]
            for course_id, value in course_dict.items():
                course_name = course_data[course_id]["name"]
                try:
                    study_count = value["count"]
                except:
                    study_count = 0
                print("%s\t\t\t\t%s\t\t\t%s" %
                      (course_id, course_name, study_count))
            print("-" * 50)
            choice = input("[B|b返回]: ")
            if choice == "B" or choice == "b":
                break

    def view_grade(self):
        print("查询成绩--")
        user_name = user_data["user_id"]
        spc_table = DatabasesCls("student_purchase_course")
        courses_table = DatabasesCls("courses")
        spc_data = spc_table.open()
        course_data = courses_table.open()
        while True:
            print("_" * 50)
            print("课程ID\t\t\t课程名称\t\t\t学习成绩")
            print("-" * 50)
            course_dict = spc_data[user_name]
            for course_id, value in course_dict.items():
                course_name = course_data[course_id]["name"]
                study_grade = value["grade"]
                print("%s\t\t\t\t%s\t\t\t%s分" %
                      (course_id, course_name, study_grade))
            print("-" * 50)
            choice = input("[B|b返回]: ")
            if choice == "B" or choice == "b":
                break