使用面向对象的思想实现学生管理系统 1、增加学生 姓名、性别、年龄、住址（省份市区--如河南洛阳） 都重复就不添加 2、根据序号删除学生 3、根据序号修改学生 4、查询所有的学生信息 5、查询所有的男生 6、查询河南的学生 7、找出未成年学生

好的，我可以给你提供一个示例代码，帮助你实现学生管理系统。以下是代码：

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

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

    def add_student(self, name, gender, age, address):
        for student in self.students:
            if student.name == name and student.gender == gender and student.age == age and student.address == address:
                print("该学生已存在！")
                return
        new_student = Student(name, gender, age, address)
        self.students.append(new_student)
        print("添加成功！")

    def remove_student(self, student_id):
        if student_id < 0 or student_id >= len(self.students):
            print("该学生不存在！")
            return
        self.students.pop(student_id)
        print("删除成功！")

    def update_student(self, student_id, name, gender, age, address):
        if student_id < 0 or student_id >= len(self.students):
            print("该学生不存在！")
            return
        for student in self.students:
            if student.name == name and student.gender == gender and student.age == age and student.address == address:
                print("该学生已存在！")
                return
        self.students[student_id].name = name
        self.students[student_id].gender = gender
        self.students[student_id].age = age
        self.students[student_id].address = address
        print("修改成功！")

    def show_all_students(self):
        if not self.students:
            print("没有学生信息！")
            return
        for i, student in enumerate(self.students):
            print(f"序号：{i}, 姓名：{student.name}, 性别：{student.gender}, 年龄：{student.age}, 地址：{student.address}")

    def show_all_male_students(self):
        male_students = []
        for student in self.students:
            if student.gender == "男":
                male_students.append(student)
        if not male_students:
            print("没有男生！")
            return
        for i, student in enumerate(male_students):
            print(f"序号：{i}, 姓名：{student.name}, 性别：{student.gender}, 年龄：{student.age}, 地址：{student.address}")

    def show_all_henan_students(self):
        henan_students = []
        for student in self.students:
            if "河南" in student.address:
                henan_students.append(student)
        if not henan_students:
            print("没有河南学生！")
            return
        for i, student in enumerate(henan_students):
            print(f"序号：{i}, 姓名：{student.name}, 性别：{student.gender}, 年龄：{student.age}, 地址：{student.address}")

    def show_all_underage_students(self):
        underage_students = []
        for student in self.students:
            if student.age < 18:
                underage_students.append(student)
        if not underage_students:
            print("没有未成年学生！")
            return
        for i, student in enumerate(underage_students):
            print(f"序号：{i}, 姓名：{student.name}, 性别：{student.gender}, 年龄：{student.age}, 地址：{student.address}")

以上是一个简单的学生管理系统示例代码，你可以在此基础上进行改进和扩展。