仅显示一个人最近 3 个分数中的最高分，保存在 .txt 文件中 [英] Displaying only the highest of a person's 3 most recent scores, saved in a .txt file

问题描述

我正在尝试学习将 Python 用于个人项目的基础知识.

I am trying to learn the fundamentals of using Python for a personal project.

我创建了一个程序，向用户询问十个地理问题，然后将他们的分数保存到一个 .txt 文件中，格式如下:

I have created a program which asks the user ten geographical questions, and then saves their score to a .txt file, in this format:

Imran - 8
Joeseph - 10
Test1 - 6
Test2 - 4
Joeseph - 5
Aaron - 4
Test1 - 1
Zzron - 1
Joeseph - 3
Test1 - 10
Joeseph - 4

然后我创建了一个新程序，可以用来按字母顺序显示每个人的最高分:

I then created a new program, which can be used to display the highest score of each person in alphabetical order:

with open("highscores.txt", "r+")as file:
    file.seek(0)
    scores = file.readlines()

user_scores = {}
for line in scores:
    name, score = line.rstrip('\n').split(' - ')
    score = int(score)
    if name not in user_scores or user_scores[name] < score:
        user_scores[name] = score

for name in sorted(user_scores):
    print(name, '-', user_scores[name])

我想更改此代码，使其仅输出一个人最近 3 个分数中的最高分.例如，从给定的 .txt 文件中，Joeseph 的分数将显示为:

I would like to alter this code, such that it only outputs the highest of a person's 3 most recent scores. For example, from the .txt file given, Joeseph's score would be displayed as:

Joeseph - 5

该程序应省略除每个人最近的 3 个分数之外的所有分数.

The program should omit all but the 3 most recent scores from each person.

推荐答案

与其在第一个 for 循环中跟踪最高分，只需跟踪最后三个分数:

Instead of keeping track of the highest score in your first for loop, just keep track of the last three scores:

user_scores = {}
for line in scores:
    name, score = line.rstrip('\n').split(' - ')
    score = int(score)
    if name not in user_scores:
        user_scores[name] = []       # Initialize score list
    user_scores[name].append(score)  # Add the most recent score
    if len(user_scores[name]) > 3:   
        user_scores[name].pop(0)     # If we've stored more than 3, get rid of the oldest

然后在最后，通过并获得最大值:

Then at the end, go through and get the maximum:

user_high_scores = {}
for name in user_scores:
    user_high_scores[name] = max(user_scores[name])   # Find the highest of the 3 most recent scores

然后你可以像以前一样打印出高分:

Then you can print out the high scores as before:

for name in sorted(user_scores):
    print(name, '-', user_scores[name])

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