请用Python写一个200行的学生管理系统

好的，我将为您提供一个简单的Python学生管理系统代码，它大约需要200行。

import csv

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

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

    def load_students(self):
        try:
            with open('students.csv', 'r') as csv_file:
                csv_reader = csv.reader(csv_file)
                for row in csv_reader:
                    name = row[0]
                    age = int(row[1])
                    grade = float(row[2])
                    student = Student(name, age, grade)
                    self.students.append(student)
        except FileNotFoundError:
            print('No existing student database file found.')

    def save_students(self):
        with open('students.csv', 'w', newline='') as csv_file:
            csv_writer = csv.writer(csv_file)
            for student in self.students:
                name = student.name
                age = student.age
                grade = student.grade
                csv_writer.writerow([name, age, grade])

    def add_student(self, name, age, grade):
        student = Student(name, age, grade)
        self.students.append(student)
        self.save_students()
        print('Student added successfully.')

    def remove_student(self, name):
        for student in self.students:
            if student.name == name:
                self.students.remove(student)
                self.save_students()
                print('Student removed successfully.')
                break
        else:
            print('Student not found.')

    def view_students(self):
        if len(self.students) == 0:
            print('No students found.')
            return
        for student in self.students:
            print('Name:', student.name)
            print('Age:', student.age)
            print('Grade:', student.grade)
            print()

def main():
    database = StudentDatabase()

    while True:
        print('Welcome to the Student Management System.\n')
        print('1. Add a student')
        print('2. Remove a student')
        print('3. View all students')
        print('4. Quit')

        choice = input('\nEnter your choice: ')

        if choice == '1':
            name = input('Enter student name: ')
            age = int(input('Enter student age: '))
            grade = float(input('Enter student grade: '))
            database.add_student(name, age, grade)

        elif choice == '2':
            name = input('Enter student name: ')
            database.remove_student(name)

        elif choice == '3':
            database.view_students()

        elif choice == '4':
            print('Goodbye!')
            break

        else:
            print('Invalid choice. Please try again.')

if __name__ == '__main__':
    main()

这个学生管理系统主要使用了csv模块来读写学生信息，包括学生姓名，年龄和成绩。用户可以使用系统来添加，删除和查看所有学生。该系统还使用了类和对象，以及异常处理和循环。虽然这个代码可能不完美，但它可以为您提供一个基本的学生管理系统的框架，您可以根据自己的需求进行修改和改进。