用python写一个学生管理系统

好的，下面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, grade):
        self.name = name
        self.id = id
        self.grade = grade

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

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

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

    def get_student(self, student_id):
        for student in self.students:
            if student.id == student_id:
                return student
        return None

    def list_students(self):
        for student in self.students:
            print("Name: ", student.name, ", ID: ", student.id, ", Grade: ", student.grade)

# Test the student management system
system = StudentManagementSystem()

# Add some students
system.add_student(Student("Alice", "1001", "A"))
system.add_student(Student("Bob", "1002", "B"))
system.add_student(Student("Charlie", "1003", "C"))

# List all students
print("All students:")
system.list_students()

# Remove a student
system.remove_student("1002")

# List all students again
print("All students after removing Bob:")
system.list_students()

# Get a student by ID
student = system.get_student("1003")
if student:
    print("Found student:", student.name)
else:
    print("Student not found")

这个学生管理系统包含了一个 `Student` 类来表示学生，以及一个 `StudentManagementSystem` 类来管理学生。你可以在 `main()` 函数中调用这些方法来添加、删除、列出和查找学生。