请用python1、输入并存储学生的信息 2、修改学生信息 3、删除学生信息 4、成绩排序 5、查找学生信息 6、进行测试 写出一个完整的代码

好的，以下是一个简单的实现：

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

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

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

    def modify_student(self, name, age, gender, grade):
        for student in self.students:
            if student.name == name:
                student.age = age
                student.gender = gender
                student.grade = grade
                break

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

    def sort_students(self):
        self.students = sorted(self.students, key=lambda student: student.grade, reverse=True)

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

    def test(self):
        student1 = Student("Alice", 18, "female", 90)
        student2 = Student("Bob", 19, "male", 85)
        student3 = Student("Charlie", 20, "male", 95)
        self.add_student(student1)
        self.add_student(student2)
        self.add_student(student3)
        self.modify_student("Alice", 19, "female", 92)
        self.delete_student("Bob")
        self.sort_students()
        print("Sorted students:")
        for student in self.students:
            print("Name: {}, Age: {}, Gender: {}, Grade: {}".format(student.name, student.age, student.gender, student.grade))
        print("Found student:")
        student = self.find_student("Charlie")
        print("Name: {}, Age: {}, Gender: {}, Grade: {}".format(student.name, student.age, student.gender, student.grade))

if __name__ == "__main__":
    manager = StudentManager()
    manager.test()

这个代码实现了一个简单的学生信息管理系统，可以添加、修改、删除、排序和查找学生信息，并且包含了一个简单的测试函数。