用python语言写一个学生管理系统代码

以下是一个简单的学生管理系统的Python代码：

class Student:
    def __init__(self, name, id_number):
        self.name = name
        self.id_number = id_number
        self.courses = []

    def add_course(self, course):
        self.courses.append(course)

    def remove_course(self, course):
        self.courses.remove(course)

class Course:
    def __init__(self, name, code):
        self.name = name
        self.code = code
        self.students = []

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

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

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

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

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

    def add_course(self, name, code):
        course = Course(name, code)
        self.courses.append(course)
        return course

    def remove_course(self, course):
        self.courses.remove(course)

    def enroll_student(self, student, course):
        student.add_course(course)
        course.add_student(student)

    def withdraw_student(self, student, course):
        student.remove_course(course)
        course.remove_student(student)

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

    def print_courses(self):
        print("Courses:")
        for course in self.courses:
            print(f"{course.name} ({course.code})")

    def print_enrollments(self):
        print("Enrollments:")
        for course in self.courses:
            print(f"{course.name} ({course.code}):")
            for student in course.students:
                print(f"    {student.name} ({student.id_number})")

# Example usage:
sms = StudentManagementSystem()

# Add students and courses
alice = sms.add_student("Alice", "123456")
bob = sms.add_student("Bob", "789012")
math = sms.add_course("Math", "MATH101")
english = sms.add_course("English", "ENGL101")

# Enroll students in courses
sms.enroll_student(alice, math)
sms.enroll_student(bob, math)
sms.enroll_student(bob, english)

# Print information
sms.print_students()
sms.print_courses()
sms.print_enrollments()

# Withdraw student from course
sms.withdraw_student(bob, math)

# Print updated information
sms.print_enrollments()

这个学生管理系统包含了学生和课程两个类，以及一个学生管理系统类。你可以通过这个系统添加、移除学生和课程，以及将学生注册到课程中，退选课程等等。在这个系统中，你可以打印出学生和课程的信息，以及所有学生的注册信息。