Python - 関数デコレーター - 関数を包む(ログイン、session、秘密鍵(secret_key))

Head First Python 第2版
原著
楽天ブックス(Kobo) Yahoo!

開発環境

macOS Mojave - 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)
Flask (パッケージ)

Head First Python 第2版 ―頭とからだで覚えるPythonの基本 (Paul Barry (著)、嶋田健志 (監修)、木下哲也 (翻訳)、オライリージャパン)の10章(関数デコレーター - 関数を包む)、自分で考えてみよう(p. 375)を取り組んでみる。

コード(Emacs)

Python 3

#!/usr/bin/env python3
# 1 sessionのインポートが必要
from flask import Flask, session

app = Flask(__name__)


@app.route('/login')
def do_login() -> str:
    session['logged_in'] = True
    return '現在ログインしています。'


# 2 秘密鍵 の設定が必要
app.secret_key = 'you will never guess'

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

入出力結果(Terminal, cmd(コマンドプロンプト), Jupyter(IPython))

$ python3 sample1.py
 * Serving Flask app "sample1" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 178-619-558
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File ".../sample1.py", line 9, in do_login
    session['logged_in'] = True
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/werkzeug/local.py", line 350, in __setitem__
    self._get_current_object()[key] = value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/sessions.py", line 101, in _fail
    raise RuntimeError('The session is unavailable because no secret '
RuntimeError: The session is unavailable because no secret key was set.  Set the secret_key on the application to something unique and secret.
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:40:41] "GET /login?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
 * Detected change in '.../sample1.py', reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 178-619-558
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File ".../sample1.py", line 9, in do_login
    session['logged_in'] = True
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/werkzeug/local.py", line 350, in __setitem__
    self._get_current_object()[key] = value
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask/sessions.py", line 101, in _fail
    raise RuntimeError('The session is unavailable because no secret '
RuntimeError: The session is unavailable because no secret key was set.  Set the secret_key on the application to something unique and secret.
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:42:42] "GET /login?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
 * Detected change in '.../sample1.py', reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 178-619-558
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /login?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
127.0.0.1 - - [13/Dec/2018 11:43:18] "GET /favicon.ico HTTP/1.1" 404 -
 * Detected change in '.../sample1.py', reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 178-619-558
 * Detected change in '.../sample1.py', reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 178-619-558
127.0.0.1 - - [13/Dec/2018 11:43:57] "GET /login HTTP/1.1" 200 -
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Python - 関数デコレーター - 関数を包む(ログイン、session、秘密鍵(secret_key))

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