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Python - List of Files: Functions, Modules and Files - return statement 2

Head First Python: A Learner’s Guide to the Fundamentals of Python Programming, A Brain-Friendly Guide、 Paul Barry(著)、 O’Reilly Mediaの Chapter 4.(List of Files: Functions, Modules and Files)、SHARPEN YOUR PENCIL(206/682)の解答を求めてみる。

コード

swimclub.py

import os
import statistics

FOLDER = 'swimdata'


def read_swim_data(filename: str):
    swimmer, age, distance, stroke = filename.removesuffix('.txt')
    with open(os.path.join(FOLDER, filename)) as f:
        lines = f.readlines()
        times = lines[0].strip().split(',')
    converts = []
    for t in times:
        minutes, rest = t.split(':')
        seconds, hundredths = rest.split('.')
        converts.append(
            int(minutes) * 60 * 100 + int(seconds) * 100 + int(hundredths)
        )
        average = statistics.mean(converts)
        mins_secs, hundredths = str(round(average / 100, 2)).split('.')
        mins_secs = int(mins_secs)
        minutes, seconds = divmod(mins_secs, 60)
        average = f'{minutes}:{seconds}.{hundredths}'
    return swimmer, age, distance, stroke, average