python写学生管理系统

以下是一个简单的学生信息管理系统的Python代码示例：

class Student:
    def __init__(self, name, age, grade):
        self.name = name
        self.age = age
        self.grade = grade

class StudentManagementSystem:
    def __init__(self):
        self.students = []

    def add_student(self, student):
        self.students.append(student)

    def remove_student(self, student):
        self.students.remove(student)

    def update_student(self, student, name=None, age=None, grade=None):
        if name:
            student.name = name
        if age:
            student.age = age
        if grade:
            student.grade = grade

    def search_student(self, name):
        for student in self.students:
            if student.name == name:
                return student
        return None

    def sort_students_by_grade(self):
        self.students.sort(key=lambda student: student.grade)

# 创建学生管理系统对象
sms = StudentManagementSystem()

# 添加学生
student1 = Student("Alice", 18, 90)
student2 = Student("Bob", 17, 85)
sms.add_student(student1)
sms.add_student(student2)

# 修改学生信息
sms.update_student(student1, age=19)

# 查询学生信息
search_result = sms.search_student("Bob")
if search_result:
    print("Student found: ", search_result.name, search_result.age, search_result.grade)
else:
    print("Student not found.")

# 按成绩排序学生
sms.sort_students_by_grade()

# 删除学生
sms.remove_student(student1)

这个学生信息管理系统包括了添加学生、删除学生、修改学生信息、查询学生信息以及按成绩排序学生等功能。你可以根据自己的需求进行扩展和修改。