Python - Reading and Writing Files - ファイルの読み込み、read関数

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 4の解答を求めてみる。

コード

#!/usr/bin/env python3
import pprint
from typing import TextIO

print('4.')


def skip_header(reader: TextIO) -> str:
    reader.readline()
    line = reader.readline()
    while line.startswith('#'):
        line = reader.readline()
    return line


def process_file(reader: TextIO) -> None:
    line = skip_header(reader).strip()
    print(line)
    print(reader.read())


if __name__ == "__main__":
    with open('hopedale.txt') as input_file:
        process_file(input_file)

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

% cat hopedale.txt
Coloured fox fur production, HOPEDALE, Labrador, 1834-1842
#Source: C. Elton (1942) "Voles, Mice and Lemmings", Oxford Univ. Press
#Table 17, p.265--266
      22   
      29   
       2   
      16   
      12   
      35   
       8   
      83   
     166   
% ./sample4.py    
4.
22
      29   
       2   
      16   
      12   
      35   
       8   
      83   
     166   

%