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Adding Flask information, bookdb exercise, etc.
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‎WebProgramming/FlaskLab/echo_flask.py‎

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"""
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Minimal Flask + forms demo
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Send HTML page that echoes message from HTTP request
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To get started, point browser at echo_flask.html
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"""
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from flask import Flask, render_template, request
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import copy
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# No need for message page
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# Flask converts view function return string to HTML page
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app = Flask(__name__)
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app.debug = True # development only - remove on production machines
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messages = []
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# View functions generate HTTP responses including HTML pages and headers
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@app.route('/echo_flask.html')
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def form():
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return render_template('form.html')
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# return form_page
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@app.route('/echo_flask.py')
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def message_page():
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# Flask Quickstart suggests request.form should work, but here it is empty
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# Flask converts return string to HTML page
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messages.insert(0,request.args['message'])
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return render_template('response.html', messages=copy.deepcopy(messages))
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# return 'Message: %s' % ("<br> Previous Message : ".join(messages))
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# No function needed for other routes - Flask will send 404 page
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if __name__ == '__main__':
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app.run()
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‎WebProgramming/FlaskLab/echo_tests.py‎

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"""
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Demonstrate Flask test support: test without server
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"""
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import echo_flask as e
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# Flask test support
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tc = e.app.test_client()
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print tc
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print
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print
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# should respond with 404
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r = tc.get('/')
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print r
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print r.data
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print
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print
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# should respond with form
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r = tc.get('/echo_flask.html')
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print r
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print r.data
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print
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print
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# should respond with message page
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r = tc.get('/echo_flask.py?message=Hello')
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print r
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print r.headers
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print r.data
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print
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print
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# This will fail if application isn't working
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#assert 'Hello' in r.data # demonstrate success
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assert 'Goodbye' in r.data # demonstrate failure

‎WebProgramming/FlaskLab/flask_lab.txt‎

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flask_lab.txt
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+--
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Week 7 Lab: Flask
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Install Flask on your computer
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Revise echo_flask.py to show all the messages received since startup.
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Suggestion: experiment with formatting the output page. What if
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you return a big string? HTML? Does the templating system help?
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To install, consult http://flask.pocoo.org/docs/installation/
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-- but I didn't take their advice. I do not recommend virtualenv
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I do not have pip installed so I tried sudo easy_install Flask
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worked for me, installed Flask 0.8, Jinja2 2.6, Werkzeug 0.8.3

‎WebProgramming/FlaskLab/templates/form.html‎

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<!-- This template is really just a static HTML page -->
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<title>Echo request</title>
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</head>
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<body>
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<form method="GET" action="echo_flask.py">
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Message: <input type="text" name="message" size="40">
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<input type="submit" value="Submit">
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</form>
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</body>
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</html>

‎WebProgramming/booksPage/__init__.py‎

Whitespace-only changes.

‎WebProgramming/booksPage/bookdb.py‎

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"""
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From Brian Dorsey's Internet Programming in Python, Winter 2011
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"""
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class BookDB():
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def titles(self):
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titles = [dict(id=id, title=database[id]['title']) for id in database.keys()]
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return titles
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def title_info(self, id):
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return database[id]
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# let's pretend we're getting this information from a database somewhere
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database = {
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'id1' : {'title' : 'CherryPy Essentials: Rapid Python Web Application Development',
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'isbn' : '978-1904811848',
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'publisher' : 'Packt Publishing (March 31, 2007)',
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'author' : 'Sylvain Hellegouarch',
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},
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'id2' : {'title' : 'Python for Software Design: How to Think Like a Computer Scientist',
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'isbn' : '978-0521725965',
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'publisher' : 'Cambridge University Press; 1 edition (March 16, 2009)',
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'author' : 'Allen B. Downey',
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},
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'id3' : {'title' : 'Foundations of Python Network Programming',
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'isbn' : '978-1430230038',
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'publisher' : 'Apress; 2 edition (December 21, 2010)',
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'author' : 'John Goerzen',
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},
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'id4' : {'title' : 'Python Cookbook, Second Edition',
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'isbn' : '978-0-596-00797-3',
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'publisher' : 'O''Reilly Media',
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'author' : 'Alex Martelli, Anna Ravenscroft, David Ascher',
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},
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'id5' : {'title' : 'The Pragmatic Programmer: From Journeyman to Master',
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'isbn' : '978-0201616224',
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'publisher' : 'Addison-Wesley Professional (October 30, 1999)',
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'author' : 'Andrew Hunt, David Thomas',
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},
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}
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‎WebProgramming/booksPage/bookdb_test.py‎

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"""
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From Brian Dorsey's Internet Programming in Python, Winter 2011
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"""
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import bookdb
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def test_list_books():
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books = bookdb.BookDB()
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titles = books.titles()
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assert len(titles) > 1
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print titles
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for title in titles:
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assert 'title' in title
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assert 'id' in title
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def test_get_book_info():
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books = bookdb.BookDB()
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titles = books.titles()
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id = titles[0]['id']
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print id
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info = books.title_info(id)
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print info
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assert 'title' in info
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assert info['title'] == titles[0]['title']
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assert 'publisher' in info
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assert 'isbn' in info
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assert 'author' in info
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‎WebProgramming/booksPage/books.py‎

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"""
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Minimal Flask + forms demo
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Send HTML page that echoes message from HTTP request
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To get started, point browser at echo_flask.html
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"""
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from flask import Flask, render_template, request
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from bookdb import BookDB
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# No need for message page
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# Flask converts view function return string to HTML page
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app = Flask(__name__)
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app.debug = True # development only - remove on production machines
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booksDB = BookDB ()
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# View functions generate HTTP responses including HTML pages and headers
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@app.route('/books.html')
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def bookList():
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return render_template('bookslist.html',titles = booksDB.titles())
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# return form_page
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@app.route('/abook/<book_id>')
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def bookInfo(book_id):
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return render_template('book.html', thisBook=booksDB.title_info(book_id))
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# return from_page
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#===============================================================================
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# @app.route('/echo_flask.py')
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# def message_page():
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# # Flask Quickstart suggests request.form should work, but here it is empty
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# # Flask converts return string to HTML page
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# messages.insert(0,request.args['message'])
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# return render_template('response.html', messages=copy.deepcopy(messages))
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# # return 'Message: %s' % ("<br> Previous Message : ".join(messages))
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#===============================================================================
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# No function needed for other routes - Flask will send 404 page
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if __name__ == '__main__':
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app.run()
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‎WebProgramming/booksPage/books.txt‎

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books.txt
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+--
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Week 7 Assignment: Books web site
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- Write a multi page website, using bookdb.py
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- Index page is a list of books, link to a detail page per book
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- Each detail page displays info about one book
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- Use any Python tech you’d like
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(from Brian Dorsey's Internet Programming in Python, Winter 2011)

‎WebProgramming/booksPage/templates/book.html‎

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<!-- This template is really just a static HTML page -->
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<title>Book List</title>
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</head>
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<body>
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<h1>{{ thisbook['title] }} : </h1>
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<div style="word-wrap: break-word; margin:20px">
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<ul id="navigation">
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{% for item in thisBook %}
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<li>{{ thisBook['item'] }} </li>
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{% endfor %}
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</ul>
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</div>
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</form>
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</body>
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</html>

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