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

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(19/108)の解答を求めてみる。

コード

swimclub.py

import statistics

FOLDER = 'swimdata/'


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