用python写学生成绩管理系统包含输入并存储学生的信息 ，修改学生信息 ，删除学生信息 ，成绩排序 ，查找学生信息

好的，下面是一个简单的学生成绩管理系统示例代码：

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

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

    def add_student(self, name, grade):
        student = Student(name, grade)
        self.students.append(student)

    def remove_student(self, name):
        for student in self.students:
            if student.name == name:
                self.students.remove(student)

    def update_student(self, name, grade):
        for student in self.students:
            if student.name == name:
                student.grade = grade

    def sort_students(self):
        self.students = sorted(self.students, key=lambda x: x.grade, reverse=True)

    def search_student(self, name):
        for student in self.students:
            if student.name == name:
                return student

    def print_students(self):
        for student in self.students:
            print(f"{student.name}: {student.grade}")

system = StudentGradeSystem()

# 添加学生信息
system.add_student("张三", 90)
system.add_student("李四", 80)
system.add_student("王五", 70)

# 输出学生信息
system.print_students()

# 修改学生信息
system.update_student("李四", 85)

# 删除学生信息
system.remove_student("王五")

# 排序并输出学生信息
system.sort_students()
system.print_students()

# 查找学生信息
student = system.search_student("张三")
if student:
    print(f"{student.name} 的成绩是 {student.grade}")
else:
    print("没有找到该学生信息")

这份代码实现了添加学生信息、修改学生信息、删除学生信息、成绩排序和查找学生信息的功能。你可以根据自己的需求进行修改和扩展。