是否可以编写一个python程序，使您能够用python对文本文件的内容进行排序

我一直在写一个数学测验，程序向学生提问，然后保存他们的分数，如下所示：

class_number = prompt_int_big("Before your score is saved ,are you in class 1, 2 or 3? Press the matching number")

filename = (str(class_number) + "txt")
with open(filename, 'a') as f:
    f.write("\n" + str(name) + " scored " + str(score) +  " on difficulty level " + str(level_of_difficulty) + "\n")
with open(filename) as f:
    lines = [line for line in f if line.strip()]
    lines.sort()

if prompt_bool("Do you wish to view previous results for your class"):
    for line in lines:
        print (line)
else:
    sys.exit("Thanks for taking part in the quiz, your teacher should discuss your score with you later")

但是，我被指示将最后三个分数保存到学生姓名中，然后显示最后三个分数的平均值。这需要将分数保存到学生姓名。我正在考虑将其外包给excel，但我不知道如何使用测试文件或文本文件在excel中打开

以下是代码的其余部分：

import random
import sys


def get_input_or_quit(prompt, quit="Q"):
    prompt += " (Press '{}' to exit) : ".format(quit)
    val = input(prompt).strip()
    if val.upper() == quit:
        sys.exit("Goodbye")
    return val

def prompt_bool(prompt):
    while True:
        val = get_input_or_quit(prompt).lower()
        if val == 'yes':
          return True
        elif val == 'no':
          return False
        else:
         print ("Invalid input '{}', please try again".format(val))


def prompt_int_small(prompt='', choices=(1,2)):
    while True:
        val = get_input_or_quit(prompt)
        try:
            val = int(val)
            if choices and val not in choices:
                raise ValueError("{} is not in {}".format(val, choices))
            return val
        except (TypeError, ValueError) as e:
                print(
                    "Not a valid number ({}), please try again".format(e)
                    )

def prompt_int_big(prompt='', choices=(1,2,3)):
    while True:
        val = get_input_or_quit(prompt)
        try:
            val = int(val)
            if choices and val not in choices:
                raise ValueError("{} is not in {}".format(val, choices))
            return val
        except (TypeError, ValueError) as e:
                print(
                    "Not a valid number ({}), please try again".format(e)
                    )

role = prompt_int_small("Are you a teacher or student? Press 1 if you are a student or 2 if you are a teacher")
if role == 1:
    score=0
    name=input("What is your name?")
    print ("Alright",name,"welcome to your maths quiz."
            " Remember to round all answers to 5 decimal places.")
    level_of_difficulty = prompt_int_big("What level of difficulty are you working at?\n"
                                 "Press 1 for low, 2 for intermediate "
                                    "or 3 for high\n")


    if level_of_difficulty == 3:
        ops = ['+', '-', '*', '/']
    else:
        ops = ['+', '-', '*']

    for question_num in range(1, 11):
        if level_of_difficulty == 1:
            max_number = 10
        else:
            max_number = 20

        number_1 = random.randrange(1, max_number)
        number_2 = random.randrange(1, max_number)
        operation = random.choice(ops)

        maths = round(eval(str(number_1) + operation + str(number_2)),5)
        print('\nQuestion number: {}'.format(question_num))
        print ("The question is",number_1,operation,number_2)
        answer = float(input("What is your answer: "))
        if answer == maths:
            print("Correct")
            score = score + 1
        else:
            print ("Incorrect. The actual answer is",maths)

    if score >5:
        print("Well done you scored",score,"out of 10")
    else:
        print("Unfortunately you only scored",score,"out of 10. Better luck next time")


    class_number = prompt_int_big("Before your score is saved ,are you in class 1, 2 or 3? Press the matching number")

    filename = (str(class_number) + 'txt')
    with open(filename, 'a') as f:
        f.write("\n" + str(name) + " scored " + str(score) +  " on difficulty level " + str(level_of_difficulty) + "\n")
    with open(filename) as f:
        lines = [line for line in f if line.strip()]
        lines.sort()

    if prompt_bool("Do you wish to view previous results for your class"):
        for line in lines:
            print (line)
    else:
        sys.exit("Thanks for taking part in the quiz, your teacher should discuss your score with you later")

---

首先，我将创建数据库，并使用sqlite的db browser查看它，如下图所示

注意：忽略db browser自动生成的顶部表格，您感兴趣的是其他2个表格。您将使用的方法是使用两个学生id将表链接在一起，每次添加一个学生时，学生id将自动递增，这意味着它将为您生成，并为每个新记录递增1

有了它，就有了您想要的所有sql，下面显示的是创建/清除表所需的sql：

sql = """CREATE TABLE `tbl_Students` (
    `StudentID` INTEGER PRIMARY KEY AUTOINCREMENT,
    `FirstName` TEXT,
    `LastName`  TEXT
         )"""
        #this is the sql that will be run
        with sqlite3.connect("studentscores.db") as db:
            cursor = db.cursor()
            cursor.execute("select name from sqlite_master where name=?",("tbl_Students",))
            result = cursor.fetchall()
            cursor.execute("drop table if exists {0}".format("tbl_Students")) #if table exist delete it
            cursor.execute(sql)
            db.commit()

        #this is the sql that will be run
        sql = """CREATE TABLE `tbl_scores` (
    `StudentID` INTEGER,
    `DateOfScore`   INTEGER,
    `Score` INTEGER
        )"""
        with sqlite3.connect("studentscores.db") as db:
            cursor = db.cursor()
            cursor.execute("select name from sqlite_master where name=?",("tbl_scores",))
            result = cursor.fetchall()
            cursor.execute("drop table if exists {0}".format("tbl_scores"))#if table exist delete it
            cursor.execute(sql)
            db.commit()
        self.cleardb.set("database cleared")

接下来是将值插入数据库

with sqlite3.connect("studentscores.db") as db:
            cursor=db.cursor()
            sql = "insert into tbl_Students (FirstName, Lastname) values (?,?)"
            cursor.execute(sql,(firstname,lastname))
            db.commit()

with sqlite3.connect("studentscores.db") as db:
            cursor=db.cursor()
            sql = "insert into tbl_scores (StudentID, DateOfScore, Score) values (?,?, ?)"
            cursor.execute(sql,(StudentID,nDateOfScore,nScore))
            db.commit()

当为分数插入值时，我会让用户先选择一个学生，这样您就可以链接两个表。我经常使用树来进行链接，但也可以使用下拉列表，通过使用数据库中的数据来填充

with sqlite3.connect("studentscores.db") as db:
            cursor=db.cursor()
            sql = "insert into tbl_Students (FirstName, Lastname) values (?,?)"
            cursor.execute(sql,(firstname,lastname))
            db.commit()

with sqlite3.connect("studentscores.db") as db:
            cursor=db.cursor()
            sql = "insert into tbl_scores (StudentID, DateOfScore, Score) values (?,?, ?)"
            cursor.execute(sql,(StudentID,nDateOfScore,nScore))
            db.commit()

第三是更新价值观

with sqlite3.connect("studentscores.db") as db:
                cursor = db.cursor()
                sql = "update tblStudents set FirstName =?,LastName=? where StudentID=?"
                cursor.execute(sql,(FirstName,LastName,StudentID))
                db.commit()

with sqlite3.connect("GuitarLessons.db") as db:
            cursor = db.cursor()
            sql = "delete from tblStudents where StudentID = ?"
            cursor.execute(sql,(StudentID))
            db.commit()

最后是删除值

with sqlite3.connect("studentscores.db") as db:
                cursor = db.cursor()
                sql = "update tblStudents set FirstName =?,LastName=? where StudentID=?"
                cursor.execute(sql,(FirstName,LastName,StudentID))
                db.commit()

with sqlite3.connect("GuitarLessons.db") as db:
            cursor = db.cursor()
            sql = "delete from tblStudents where StudentID = ?"
            cursor.execute(sql,(StudentID))
            db.commit()

我已经做了一个简单的例子，你可以添加新的学生和分数，并清除数据库注释，我把他们都放在一个表单上，但最好是把他们放在不同的菜单系统上，他们必须通过这个菜单系统。这包括将你的代码分成不同的类，如果使用object，则更改顶层定向编程 注：我使用面向对象编程实现了这一点

然后，为了满足您在问题中的要求，我将创建一个树状视图，用户在其中输入学生姓名，并在sql中使用该名称来获取所有学生的分数，然后将这些分数按顺序排序，取前3名并取平均值

要对这些日期进行排序，请首先将它们转换为日期时间-

---

然后，要对它们进行排序-

请不要让我们先解析您的代码，以确定您的文件格式。此外，问题标题与您在问题中描述的任务有什么关系？此外，文件I/O是问题所在，还是创建适当的映射是问题所在？我们应该从哪里开始？TL；医生：对不起，我不知道我基本上是说你的问题不清楚，你应该阅读我给你的链接。读了这篇评论后，我仍然不明白。你能帮我吗。你不明白我有多绝望你以前用过SQL吗？您可以使用一个数据库，该数据库将存储两个表，使用主键和外键进行学生和分数链接，然后当询问最后3个分数的平均值时，获取所有学生的分数，并过滤掉最新的3个。我认为这比使用excel或txt文件要好。