用python写个学生管理系统

好的，以下是一个简单的学生管理系统的Python代码示例：

class Student:
    def __init__(self, name, id_num, grade):
        self.name = name
        self.id_num = id_num
        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 search_student(self, id_num):
        for student in self.students:
            if student.id_num == id_num:
                return student
        return None

    def print_all_students(self):
        for student in self.students:
            print(f"Name: {student.name}, ID: {student.id_num}, Grade: {student.grade}")

# Example usage:
sms = StudentManagementSystem()

s1 = Student("Alice", "1234", "A")
sms.add_student(s1)

s2 = Student("Bob", "5678", "B")
sms.add_student(s2)

sms.print_all_students()

found_student = sms.search_student("1234")
if found_student:
    print(f"Found student: {found_student.name}")
else:
    print("Student not found.")

这个代码包括一个 `Student` 类，它有一个名称、ID号和成绩。 `StudentManagementSystem` 类是一个简单的管理系统，它可以添加、删除和查找学生，以及打印所有学生的信息。在这个示例中，我们创建了两个学生并将它们添加到管理系统中。我们还打印了所有学生的信息，并查找了一个学生。