python学生管理系统代码

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

    def display_student(self):
        print(f"Name: {self.name}, Age: {self.age}, Grade: {self.grade}")


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

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

    def remove_student(self, student):
        if student in self.students:
            self.students.remove(student)
            print(f"{student.name} removed from the system.")
        else:
            print(f"{student.name} is not in the system.")

    def display_all_students(self):
        print("List of all students:")
        for student in self.students:
            student.display_student()


# 示例用法
if __name__ == "__main__":
    system = StudentManagementSystem()

    # 添加学生
    student1 = Student("Alice", 20, "A")
    student2 = Student("Bob", 21, "B")
    student3 = Student("Charlie", 19, "C")

    system.add_student(student1)
    system.add_student(student2)
    system.add_student(student3)

    # 显示所有学生
    system.display_all_students()

    # 移除学生
    system.remove_student(student2)

    # 再次显示所有学生
    system.display_all_students()

这个代码包含了两个类：Student 和 StudentManagementSystem。Student 类用于创建学生对象，包括学生的姓名、年龄和成绩。StudentManagementSystem 类用于管理学生对象，包括添加学生、移除学生和显示所有学生信息的功能。

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

    def display_student(self):
        print(f"Name: {self.name}, Age: {self.age}, Grade: {self.grade}")


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

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

    def remove_student(self, student):
        if student in self.students:
            self.students.remove(student)
            print(f"{student.name} removed from the system.")
        else:
            print(f"{student.name} is not in the system.")

    def display_all_students(self):
        print("List of all students:")
        for student in self.students:
            student.display_student()

    def search_student(self, name):
        found = False
        for student in self.students:
            if student.name.lower() == name.lower():
                print("Student Found:")
                student.display_student()
                found = True
                break
        if not found:
            print(f"Student with name '{name}' not found.")

    def update_student_grade(self, name, new_grade):
        for student in self.students:
            if student.name.lower() == name.lower():
                student.grade = new_grade
                print(f"Grade updated for {student.name} to {new_grade}.")
                break
        else:
            print(f"Student with name '{name}' not found.")


# 示例用法
if __name__ == "__main__":
    system = StudentManagementSystem()

    # 添加学生
    student1 = Student("Alice", 20, "A")
    student2 = Student("Bob", 21, "B")
    student3 = Student("Charlie", 19, "C")

    system.add_student(student1)
    system.add_student(student2)
    system.add_student(student3)

    # 显示所有学生
    system.display_all_students()

    # 搜索学生
    system.search_student("Bob")

    # 更新学生成绩
    system.update_student_grade("Bob", "A")

    # 显示所有学生
    system.display_all_students()

这个扩展后的学生管理系统添加了搜索学生和更新学生成绩的功能。你可以根据需要进一步扩展该系统，比如持久化存储学生信息、增加更多的属性和方法等。