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使用python实现学生成绩管理系统

article 2024/10/20 20:35:29

以下是一个使用Python实现的简单学生成绩管理系统：

# 定义一个空字典来存储学生信息和成绩
students = {}


# 函数用于添加学生信息和成绩
def add_student():
    student_id = input("请输入学生学号: ")
    if student_id in students:
        print("该学号已存在，请重新输入。")
        return
    name = input("请输入学生姓名: ")
    num_subjects = int(input("请输入该学生的科目数量: "))
    subjects = []
    grades = []
    for i in range(num_subjects):
        subject = input(f"请输入第{i + 1}个科目的名称: ")
        subjects.append(subject)
        grade = float(input(f"请输入{subject}的成绩: "))
        grades.append(grade)
    students[student_id] = {'name': name,'subjects': subjects, 'grades': grades}
    print(f"{name}同学的信息已成功添加。")


# 函数用于查询学生成绩
def query_student():
    student_id = input("请输入要查询的学生学号: ")
    if student_id not in students:
        print("该学号不存在，请重新输入。")
        return
    student = students[student_id]
    print(f"学生姓名: {student['name']}")
    for subject, grade in zip(student['subjects'], student['grades']):
        print(f"{subject}: {grade}")


# 函数用于计算所有学生某一科目的平均分
def calculate_average(subject_name):
    total_grade = 0
    num_students = 0
    for student in students.values():
        if subject_name in student['subjects']:
            index = student['subjects'].index(subject_name)
            total_grade += student['grades'][index]
            num_students += 1
    if num_students == 0:
        print(f"没有学生选修{subject_name}科目。")
        return
    average = total_grade / num_students
    print(f"{subject_name}科目的平均成绩为: {average}")


while True:
    print("1. 添加学生信息和成绩")
    print("2. 查询学生成绩")
    print("3. 计算某科目平均分")
    print("4. 退出系统")
    choice = int(input("请输入你的选择: "))
    if choice == 1:
        add_student()
    elif choice == 2:
        query_student()
    elif choice == 3:
        subject_name = input("请输入要计算平均分的科目名称: ")
        calculate_average(subject_name)
    elif choice == 4:
        break
    else:
        print("无效的选择，请重新输入。")