用PYTHON写一个简单的学生管理系统

```python

class Student:

def __init__(self, name, age, gender):

self.name = name

self.age = age

self.gender = gender

def display_info(self):

print(f"姓名：{self.name}")

print(f"年龄：{self.age}")

print(f"性别：{self.gender}")

class StudentManagementSystem:

def __init__(self):

self.students = []

def add_student(self, name, age, gender):

student = Student(name, age, gender)

self.students.append(student)

def delete_student(self, name):

for student in self.students:

if student.name == name:

self.students.remove(student)

return True

return False

def update_student(self, name, age, gender):

for student in self.students:

if student.name == name:

student.age = age

student.gender = gender

return True

return False

def display_students(self):

for student in self.students:

student.display_info()

# 示例

student_system = StudentManagementSystem()

student_system.add_student("张三", 18, "男")

student_system.add_student("李四", 19, "女")

student_system.display_students()

student_system.update_student("张三", 20, "女")

student_system.display_students()

student_system.delete_student("李四")

student_system.display_students()

```

这是一个简单的学生管理系统，包括以下功能：

1. 添加学生：通过`add_student`方法将学生信息添加到系统中。

2. 删除学生：通过`delete_student`方法从系统中删除指定姓名的学生。

3. 更新学生信息：通过`update_student`方法更新指定学生的年龄和性别。

4. 显示所有学生信息：通过`display_students`方法显示系统中所有学生的姓名、年龄和性别。