Python - Reading and Writing Files - forループ、文字列、split関数、リストのリスト(入れ子)

Practical Programming
楽天ブックス 紀伊国屋書店

開発環境

• macOS Catalina - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Python 3.7 (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3.6 (Paul Gries(著)、Jennifer Campbell(著)、Jason Montojo(著)、Pragmatic Bookshelf)のChapter 10(Reading and Writing Files)、Exercise 2の解答を求めてみる。

コード

#!/usr/bin/env python3
import pprint
from typing import List, Tuple

filename = 'alkaline_metals.txt'

list_of_lists: list = []
with open(filename) as f:
    for line in f:
        name, number, weight = line.strip().split()
        list_of_lists.append([name, int(number), float(weight)])

pprint.pprint(list_of_lists)

入出力結果(Zsh、PowerShell、Terminal、Jupyter(IPython))

% mypy sample2.py 
Success: no issues found in 1 source file
% ./sample2.py 
[['beryllium', 4, 9.012],
 ['magnesium', 12, 24.305],
 ['calcium', 20, 20.078],
 ['strontium', 38, 87.62],
 ['barium', 56, 137.327],
 ['radium', 88, 226.0]]
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