Beginning Python - From Novice to Professional

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CHAPTER 26 ■ PROJECT 7: YOUR OWN BULLETIN BOARD 491 curs = conn.cursor() print """ The FooBar Bulletin Board The FooBar Bulletin Board """ curs.execute('SELECT * FROM messages') rows = curs.dictfetchall() toplevel = [] children = {} for row in rows: parent_id = row['reply_to'] if parent_id is None: toplevel.append(row) else: children.setdefault(parent_id,[]).append(row) def format(row): print '%(subject)s' % row try: kids = children[row['id']] except KeyError: pass else: print '' for kid in kids: format(kid) print '' print '' for row in toplevel: format(row) print """ Post message """
492 CHAPTER 26 ■ PROJECT 7: YOUR OWN BULLETIN BOARD view.cgi The view script uses the supplied CGI parameter id to retrieve a single message from the database. It then formats a simple HTML page with the resulting values. This page also contains a link back to the main page (main.cgi) and, perhaps more interestingly, to edit.cgi, but this time with the reply_to parameter set to id to ensure that the new message will be a reply to the current one. See Listing 26-5 for the code of view.cgi. Listing 26-5. The Message Viewer (view.cgi) #!/usr/bin/python print 'Content-type: text/html\n' import cgitb; cgitb.enable() import psycopg conn = psycopg.connect('dbname=foo user=bar') curs = conn.cursor() import cgi, sys form = cgi.FieldStorage() id = form.getvalue('id') print """ View Message View Message """ try: id = int(id) except: print 'Invalid message ID' sys.exit() curs.execute('SELECT * FROM messages WHERE id = %i' % id) rows = curs.dictfetchall() if not rows: print 'Unknown message ID' sys.exit() row = rows[0]
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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CHAPTER 1 ■ ■ ■ Instant Hacki
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110 CHAPTER 6 ■ ABSTRACTION But w
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140 CHAPTER 7 ■ MORE ABSTRACTION
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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314 CHAPTER 15 ■ PYTHON AND THE W
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558 APPENDIX B ■ PYTHON REFERENCE
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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■INDEX 595 Python C API 365 hand-
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