Python - Storing and Manipulating Data: Where to Put Your Data(Log Single Line of Delimited Data, print function, sep)

Head First Python

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Python 3.6 (プログラミング言語)

Head First Python (Paul Barry (著)、O'Reilly Media)のChapter 6.(Storing and Manipulating Data: Where to Put Your Data)の EXERCISE(No. 5119) を取り組んでみる。

EXERCISE(No. 5119)

コード(Emacs)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from flask import Flask, render_template, request, escape
from vsearch import search4letters

app = Flask(__name__)


@app.route('/search4', methods=['POST'])
def do_search() -> 'html':
    phrase = request.form['phrase']
    letters = request.form['letters']
    title = 'Here are your results:'
    results = str(search4letters(phrase, letters))
    log_request(request, results)
    return render_template('results.html',
                           the_title=title,
                           the_phrase=phrase,
                           the_results=results,
                           the_letters=letters)


@app.route('/')
@app.route('/entry')
def entry_page() -> 'html':
    return render_template('entry.html',
                           the_title='Welcome to search4letters on the web!')


@app.route('/viewlog')
def view_the_log() -> str:
    with open('vsearch.log') as f:
        contents = f.read()
    return escape(contents)


def log_request(req: 'flask_request', res: str) -> None:
    with open('vsearch.log', 'a') as f:
        print(req.form, req.remote_addr, req.user_agent, res, file=f, sep='|')

if __name__ == '__main__':
    app.run(debug=True)

入出力結果(Terminal, IPython)

$ ./vsearch4web.py
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 873-014-066
127.0.0.1 - - [29/Jul/2017 21:49:06] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [29/Jul/2017 21:49:06] "GET /static/hf.css HTTP/1.1" 404 -
127.0.0.1 - - [29/Jul/2017 21:49:08] "POST /search4 HTTP/1.1" 200 -
127.0.0.1 - - [29/Jul/2017 21:49:08] "GET /static/hf.css HTTP/1.1" 404 -
127.0.0.1 - - [29/Jul/2017 21:49:15] "POST /search4 HTTP/1.1" 200 -
127.0.0.1 - - [29/Jul/2017 21:49:15] "GET /static/hf.css HTTP/1.1" 404 -
127.0.0.1 - - [29/Jul/2017 21:49:23] "POST /search4 HTTP/1.1" 200 -
127.0.0.1 - - [29/Jul/2017 21:49:23] "GET /static/hf.css HTTP/1.1" 404 -
127.0.0.1 - - [29/Jul/2017 21:49:33] "GET /viewlog HTTP/1.1" 200 -
127.0.0.1 - - [29/Jul/2017 21:49:34] "GET /viewlog HTTP/1.1" 200 -
  C-c C-c$ cat vsearch.log 
ImmutableMultiDict([('phrase', ''), ('letters', 'aeiou')])|127.0.0.1|Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8|set()
ImmutableMultiDict([('phrase', 'Python'), ('letters', 'aeiou')])|127.0.0.1|Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8|{'o'}
ImmutableMultiDict([('phrase', 'Flask'), ('letters', 'aeiou')])|127.0.0.1|Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8|{'a'}
$