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* add answer for week 4 homework
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‎assignments/teachers/week04/answers/bookdb.py‎

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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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}

‎assignments/teachers/week04/answers/homework.py‎

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#!/usr/bin/python
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import re
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class MyApplication(object):
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page_template = """
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<!DOCTYPE html>
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<html>
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<head><title>%(page_title)s</title></head>
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<body>
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%(page_body)s
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</body>
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</html>
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"""
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def __init__(self, db, urls):
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self.db = db
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self.urls = urls
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def __call__(self, environ, start_response):
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headers = [('Content-type', 'text/html')]
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try:
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path = environ.get('PATH_INFO', None)
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if path is None:
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raise NameError
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func, args = self._get_callable(path.lstrip('/'))
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body = func(*args)
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status = "200 OK"
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headers.append(('Content-length', str(len(body))))
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except NameError:
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status = "404 Not Found"
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body = self.page_template % {'page_title': 'Not Found',
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'page_body': '404 Not Found'}
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except ValueError:
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status = "501 Not Implemented"
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body = 'That URI is not implemented'
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except:
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status = "500 Internal Server Error"
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body = 'There has been an error, try again later'
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finally:
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start_response(status, headers)
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return [body]
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def books(self):
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core = ['<h1>Book Database</h1>',
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'<ul>']
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tmpl = '<li><a href="book/%s">%s</a></li>'
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for book_id, book_data in self.db.items():
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core.append(tmpl % (book_id, book_data['title']))
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core.append('</ul>')
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body = "\n".join(core)
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context = {'page_title': "Book Database",
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'page_body': body}
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return self.page_template % context
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def book(self, id):
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tmpl = """
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<h1>%(title)s</h1>
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<dl>
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<dt>ISBN</dt>
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<dd>%(isbn)s</dd>
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<dt>Author(s)</dt>
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<dd>%(author)s</dd>
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<dt>Publisher</dt>
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<dd>%(publisher)s</dd>
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</dl>
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<p><a href="../">More Books</a></p>
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"""
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book = self.db.get(id, None)
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if book is None:
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raise NameError
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title = "Book Database: %s" % book['isbn']
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context = {'page_title': title,
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'page_body': tmpl % book}
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return self.page_template % context
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def _get_callable(self, path):
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for regexp, funcname in self.urls:
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match = re.match(regexp, path)
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# if there is no match for the path, it's a 404 error
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if match is None:
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continue
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# if the match names a method that does not exist, its a 501
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func = getattr(self, funcname, None)
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if func is None:
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raise ValueError
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# get all subgroup matches from the regexp as args
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args = match.groups([])
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return func, args
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raise NameError
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URLS = [(r'^$', 'books'),
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(r'^book/(id[\d]{1,2})$', 'book'), ]
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if __name__ == '__main__':
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# this block will be called when the script is run directly
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from wsgiref.simple_server import make_server
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import bookdb
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application = MyApplication(bookdb.database, URLS)
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srv = make_server('localhost', 8080, application)
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srv.serve_forever()
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else:
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# this block will be called when the script is run on a VM via mod_wsgi
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#
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# we need to place bookdb.py in some location on the server, and then
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# add that location to the sys.path variable in order to allow mod_wsgi
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# to import bookdb
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#
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# in addition, apache must be configured with the following:
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# WSGIScriptAlias /books /path/on/server/to/homework.py
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import sys
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sys.path.append('/path/to/directory/containing/bookdb/on/server')
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import bookdb
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application = MyApplication(bookdb.database, URLS)

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