Beginning Python - From Novice to Professional

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CHAPTER 26 ■ PROJECT 7: YOUR OWN BULLETIN BOARD 493 print """ Subject: %(subject)s Sender: %(sender)s %(text)s Back to the main page | Reply """ % row edit.cgi The edit script actually performs a dual function—it is used to edit new messages, but also to edit replies. The difference isn’t all that great: If a reply_to is supplied in the CGI request, it is kept in a hidden input in the edit form. Also, the subject is set to "Re: parentsubject" by default (unless the subject already begins with "Re:"—you don’t want to keep adding those). Here is the code snippet that takes care of these details: subject = '' if reply_to is not None: print '' % reply_to curs.execute('SELECT subject FROM messages WHERE id = %s' % reply_to) subject = curs.fetchone()[0] if not subject.startswith('Re: '): subject = 'Re: ' + subject ■Tip Hidden inputs are used to temporarily store information in a Web form. They don’t show up to the user as text areas and the like do, but their value is still passed to the CGI script that is the action of the form. That way the script that generates the form can pass information to the script that will eventually process the same form. Listing 26-6 shows the source code for the edit script. Listing 26-6. The Message Editor (edit.cgi) #!/usr/bin/python print 'Content-type: text/html\n' import cgitb; cgitb.enable()
494 CHAPTER 26 ■ PROJECT 7: YOUR OWN BULLETIN BOARD import psycopg conn = psycopg.connect('dbname=foo user=bar') curs = conn.cursor() import cgi, sys form = cgi.FieldStorage() reply_to = form.getvalue('reply_to') print """ Compose Message Compose Message """ subject = '' if reply_to is not None: print '' % reply_to curs.execute('SELECT subject FROM messages WHERE id = %s' % reply_to) subject = curs.fetchone()[0] if not subject.startswith('Re: '): subject = 'Re: ' + subject print """ Subject: Sender: Message: Back to the main page' """ % subject save.cgi Now on to the final script. The save script will receive information about a message (from the form generated by edit.cgi) and will store it in the database. That means using an SQL insert
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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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82 CHAPTER 5 ■ CONDITIONALS, LOOP
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110 CHAPTER 6 ■ ABSTRACTION But w
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140 CHAPTER 7 ■ MORE ABSTRACTION
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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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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358 CHAPTER 17 ■ EXTENDING PYTHON
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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 581 get method 74-75 has_k
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■INDEX 589 localtime function tim
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■INDEX 595 Python C API 365 hand-
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