2. 键盘输入6名学生信息（学号、姓名、专业、性别、班级、出生年月日、两门课程的成绩），计算每名学生总分，将原有数据和平均分存放在磁盘文件JXXYstu.txt中。

这是一个简单的Python实现：

# 定义学生类
class Student:
    def __init__(self, id, name, major, gender, class_name, birthday, score1, score2):
        self.id = id
        self.name = name
        self.major = major
        self.gender = gender
        self.class_name = class_name
        self.birthday = birthday
        self.score1 = score1
        self.score2 = score2
    
    # 计算总分
    def total_score(self):
        return self.score1 + self.score2

# 存储学生信息的列表
students = []

# 输入6名学生信息
for i in range(6):
    id = input("请输入学号：")
    name = input("请输入姓名：")
    major = input("请输入专业：")
    gender = input("请输入性别：")
    class_name = input("请输入班级：")
    birthday = input("请输入出生年月日：")
    score1 = float(input("请输入第一门课程成绩："))
    score2 = float(input("请输入第二门课程成绩："))
    student = Student(id, name, major, gender, class_name, birthday, score1, score2)
    students.append(student)

# 计算总分和平均分
total_score = 0
for student in students:
    total_score += student.total_score()
average_score = total_score / len(students)

# 写入文件
with open("JXXYstu.txt", "w") as f:
    for student in students:
        f.write(f"{student.id} {student.name} {student.major} {student.gender} {student.class_name} {student.birthday} {student.score1} {student.score2} {student.total_score()} {average_score}\n")

运行程序后，会提示你输入6名学生的信息，然后程序会计算每名学生的总分和平均分，并将原有数据和平均分存储在JXXYstu.txt文件中。