建立一个简单的学生信息管理系统

以下是一个简单的学生信息管理系统的程序示例：

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

    def __str__(self):
        return f"{self.name}({self.gender}), {self.age} years old, in grade {self.grade}"

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

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

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

    def search_student(self, name):
        for student in self.students:
            if student.name == name:
                return student
        return None

    def display_all(self):
        for student in self.students:
            print(student)

# 测试
sms = StudentManagementSystem()

student1 = Student("Tom", 18, "male", 12)
student2 = Student("Lucy", 17, "female", 11)
student3 = Student("Jack", 16, "male", 10)

sms.add_student(student1)
sms.add_student(student2)
sms.add_student(student3)

sms.display_all()

sms.remove_student("Lucy")

print(sms.search_student("Tom"))

这个程序创建了一个Student类来存储学生信息。StudentManagementSystem类用来管理所有学生信息。可以添加、删除、查找和显示学生信息。在测试部分，我们创建了三个学生并将它们添加到学生管理系统中。然后，我们显示所有学生信息，并删除了一个学生。最后，我们搜索一个学生并显示其信息。