Python学生成绩管理系统

以下是一个简单的Python学生成绩管理系统，包括录入学生信息、查找学生信息、删除学生信息、修改学生信息、排序、统计学生总人数和显示所有学生信息等功能：

import os

filename = 'students.txt'

# 录入学生信息
def insert():
    student_list = []
    while True:
        id = input('请输入学生ID（如1001）：')
        if not id:
            break
        name = input('请输入学生姓名：')
        if not name:
            break
        try:
            english = int(input('请输入英语成绩：'))
            python = int(input('请输入Python成绩：'))
            c = int(input('请输入C语言成绩：'))
        except:
            print('输入无效，不是整数类型，请重新录入。')
            continue
        # 将录入的学生信息保存到字典中
        student = {'id': id, 'name': name, 'english': english, 'python': python, 'c': c}
        # 将学生信息添加到列表中
        student_list.append(student)
        answer = input('是否继续添加？（y/n）：')
        if answer == 'n':
            break
    # 将学生信息保存到文件中
    save(student_list)

# 查找学生信息
def search():
    student_id = input('请输入要查找的学生ID：')
    if student_id:
        if os.path.exists(filename):
            with open(filename, 'r', encoding='utf-8') as rfile:
                students = rfile.readlines()
                for student in students:
                    student = eval(student)
                    if student['id'] == student_id:
                        print(f"找到学生信息，学生ID：{student['id']}，姓名：{student['name']}，英语成绩：{student['english']}，Python成绩：{student['python']}，C语言成绩：{student['c']}")
                        break
                else:
                    print('未找到该学生信息！')
        else:
            print('暂未保存学生信息！')

# 删除学生信息
def delete():
    student_id = input('请输入要删除的学生ID：')
    if student_id:
        if os.path.exists(filename):
            with open(filename, 'r', encoding='utf-8') as rfile:
                students = rfile.readlines()
            with open(filename, 'w', encoding='utf-8') as wfile:
                for student in students:
                    student = eval(student)
                    if student['id'] != student_id:
                        wfile.write(str(student))
            print(f'ID为{student_id}的学生信息已被删除！')
        else:
            print('暂未保存学生信息！')

# 修改学生信息
def modify():
    student_id = input('请输入要修改的学生ID：')
    if student_id:
        if os.path.exists(filename):
            with open(filename, 'r', encoding='utf-8') as rfile:
                students = rfile.readlines()
            with open(filename, 'w', encoding='utf-8') as wfile:
                for student in students:
                    student = eval(student)
                    if student['id'] == student_id:
                        student['name'] = input('请输入姓名：')
                        student['english'] = int(input('请输入英语成绩：'))
                        student['python'] = int(input('请输入Python成绩：'))
                        student['c'] = int(input('请输入C语言成绩：'))
                    wfile.write(str(student))
            print(f'ID为{student_id}的学生信息已被修改！')
        else:
            print('暂未保存学生信息！')

# 排序
def sort():
    if os.path.exists(filename):
        with open(filename, 'r', encoding='utf-8') as rfile:
            students = rfile.readlines()
        students = [eval(student) for student in students]
        asc_or_desc = input('请选择（0升序；1降序）：')
        if asc_or_desc == '0':
            students.sort(key=lambda x: x['id'], reverse=False)
        elif asc_or_desc == '1':
            students.sort(key=lambda x: x['id'], reverse=True)
        else:
            print('输入错误，请重新输入！')
            sort()
        show_student(students)
    else:
        print('暂未保存学生信息！')

# 统计学生总人数
def total():
    if os.path.exists(filename):
        with open(filename, 'r', encoding='utf-8') as rfile:
            students = rfile.readlines()
            if students:
                print(f'共有{len(students)}名学生！')
            else:
                print('暂未录入学生信息！')
    else:
        print('暂未保存学生信息！')

# 显示所有学生信息
def show():
    if os.path.exists(filename):
        with open(filename, 'r', encoding='utf-8') as rfile:
            students = rfile.readlines()
            if students:
                show_student(students)
            else:
                print('暂未录入学生信息！')
    else:
        print('暂未保存学生信息！')

# 将学生信息保存到文件中
def save(student):
    try:
        students_txt = open(filename, 'a', encoding='utf-8')
    except Exception as e:
        students_txt = open(filename, 'w', encoding='utf-8')
    for info in student:
        students_txt.write(str(info) + '\n')
    students_txt.close()

# 显示学生信息
def show_student(students):
    print('学生信息如下：')
    print('学生ID\t\t姓名\t\t英语成绩\tPython成绩\tC语言成绩\t总成绩')
    for student in students:
        print(f"{student['id']}\t\t{student['name']}\t\t{student['english']}\t\t{student['python']}\t\t{student['c']}\t\t{student['english'] + student['python'] + student['c']}")

# 菜单显示函数
def menu():
    print('============学生信息管理系统============')
    print('---------------功能菜单---------------')
    print('\t\t\t1.录入学生信息')
    print('\t\t\t2.查找学生信息')
    print('\t\t\t3.删除学生信息')
    print('\t\t\t4.修改学生信息')
    print('\t\t\t5.排序')
    print('\t\t\t6.统计学生总人数')
    print('\t\t\t7.显示所有学生信息')
    print('\t\t\t0.退出系统')
    print('-------------------------------------')

# 主函数
def main():
    while True:
        menu()
        option = input('请选择操作：')
        option_str = ['0', '1', '2', '3', '4', '5', '6', '7']
        if option not in option_str:
            print('输入错误，请重新输入！')
            continue
        elif option == '0':
            answer = input('确定要退出系统吗？（y/n）：')
            if answer == 'y':
                break
            else:
                continue
        elif option == '1':
            insert()
        elif option == '2':
            search()
        elif option == '3':
            delete()
        elif option == '4':
            modify()
        elif option == '5':
            sort()
        elif option == '6':
            total()
        elif option == '7':
            show()

if __name__ == '__main__':
    main()