如何用python写一个可以录入学生信息、录入学生成绩、查询学生信息、查询学生成绩、修改学生成绩、删除学生成绩的系统

你可以使用Python语言来实现一个简单的学生成绩管理系统，以下是一个示例代码：

class Student:
    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.gender = gender
        self.grades = {}

    def add_grade(self, subject, grade):
        self.grades[subject] = grade

    def get_grade(self, subject):
        return self.grades.get(subject)

    def get_info(self):
        return f"Name: {self.name}, Age: {self.age}, Gender: {self.gender}"

class StudentManagement:
    def __init__(self):
        self.students = {}

    def add_student(self, student):
        self.students[student.name] = student

    def remove_student(self, name):
        if name in self.students:
            del self.students[name]

    def add_grade(self, name, subject, grade):
        if name in self.students:
            self.students[name].add_grade(subject, grade)

    def get_grade(self, name, subject):
        if name in self.students:
            return self.students[name].get_grade(subject)

    def get_info(self, name):
        if name in self.students:
            return self.students[name].get_info()

management = StudentManagement()

while True:
    print("1. Add Student")
    print("2. Remove Student")
    print("3. Add Grade")
    print("4. Get Grade")
    print("5. Get Info")
    print("6. Exit")
    choice = input("Enter your choice: ")

    if choice == "1":
        name = input("Enter name: ")
        age = input("Enter age: ")
        gender = input("Enter gender: ")
        student = Student(name, age, gender)
        management.add_student(student)
        print("Student added successfully!")
    elif choice == "2":
        name = input("Enter name: ")
        management.remove_student(name)
        print("Student removed successfully!")
    elif choice == "3":
        name = input("Enter name: ")
        subject = input("Enter subject: ")
        grade = input("Enter grade: ")
        management.add_grade(name, subject, grade)
        print("Grade added successfully!")
    elif choice == "4":
        name = input("Enter name: ")
        subject = input("Enter subject: ")
        grade = management.get_grade(name, subject)
        if grade is None:
            print("Grade not found!")
        else:
            print(f"Grade for {name} in {subject}: {grade}")
    elif choice == "5":
        name = input("Enter name: ")
        info = management.get_info(name)
        if info is None:
            print("Student not found!")
        else:
            print(info)
    elif choice == "6":
        break
    else:
        print("Invalid choice!")

这段代码中，`Student`类表示一个学生，包含姓名、年龄、性别以及成绩信息。`StudentManagement`类表示学生管理系统，包含添加学生、删除学生、录入成绩、查询成绩、查询学生信息等功能。在主程序中，使用一个循环来接收用户的输入，根据用户的选择执行相应的操作。你可以根据自己的需求进行修改和扩展。