帮我用python语言写一个学生信息管理系统

好的，以下是一个简单的学生信息管理系统的Python代码：

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

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

    def add_student(self, name, age, gender, grade):
        student = Student(name, age, gender, grade)
        self.students.append(student)

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

    def update_student(self, name, age=None, gender=None, grade=None):
        for student in self.students:
            if student.name == name:
                if age:
                    student.age = age
                if gender:
                    student.gender = gender
                if grade:
                    student.grade = grade

    def search_student(self, name):
        for student in self.students:
            if student.name == name:
                return student

    def display_all_students(self):
        for student in self.students:
            print(f"Name: {student.name}, Age: {student.age}, Gender: {student.gender}, Grade: {student.grade}")

# Example usage
sms = StudentManagementSystem()
sms.add_student("Alice", 18, "Female", "A")
sms.add_student("Bob", 19, "Male", "B")
sms.display_all_students()
sms.update_student("Bob", age=20, grade="A")
sms.display_all_students()
sms.delete_student("Alice")
sms.display_all_students()

这段代码定义了一个`Student`类和一个`StudentManagementSystem`类。`Student`类用于存储学生的信息，包括姓名、年龄、性别和成绩。`StudentManagementSystem`类用于管理学生信息，包括添加、删除、更新和搜索学生信息，以及显示所有学生信息。

在代码示例中，我们创建了一个`StudentManagementSystem`对象`sms`，然后添加了两个学生信息，分别是"Alice"和"Bob"。接着，我们显示了所有学生信息，然后更新了"Bob"的年龄和成绩，再次显示所有学生信息，然后删除了"Alice"的信息，并再次显示所有学生信息。