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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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CHAPTER 3 ■ WORKING WITH STRINGS
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CHAPTER 4 ■ ■ ■ Dictionaries:
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82 CHAPTER 5 ■ CONDITIONALS, LOOP
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100 CHAPTER 5 ■ CONDITIONALS, LOO
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110 CHAPTER 6 ■ ABSTRACTION But w
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112 CHAPTER 6 ■ ABSTRACTION ■Ti
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114 CHAPTER 6 ■ ABSTRACTION Can I
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124 CHAPTER 6 ■ ABSTRACTION Also,
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128 CHAPTER 6 ■ ABSTRACTION ■No
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130 CHAPTER 6 ■ ABSTRACTION So yo
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134 CHAPTER 6 ■ ABSTRACTION LAMBD
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136 CHAPTER 6 ■ ABSTRACTION In th
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138 CHAPTER 6 ■ ABSTRACTION Scope
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140 CHAPTER 7 ■ MORE ABSTRACTION
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160 CHAPTER 8 ■ EXCEPTIONS >>> im
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170 CHAPTER 8 ■ EXCEPTIONS If you
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CHAPTER 9 ■ ■ ■ Magic Methods
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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CHAPTER 10 ■ ■ ■ Batteries In
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CHAPTER 10 ■ BATTERIES INCLUDED 2
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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CHAPTER 13 ■ ■ ■ Database Sup
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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314 CHAPTER 15 ■ PYTHON AND THE W
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CHAPTER 16 ■ ■ ■ Testing, 1-2
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358 CHAPTER 17 ■ EXTENDING PYTHON
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CHAPTER 18 ■ ■ ■ Packaging Yo
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CHAPTER 18 ■ PACKAGING YOUR PROGR
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CHAPTER 19 ■ ■ ■ Playful Prog
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392 CHAPTER 20 ■ PROJECT 1: INSTA
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CHAPTER 21 ■ ■ ■ Project 2: P
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CHAPTER 22 ■ ■ ■ Project 3: X
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CHAPTER 22 ■ PROJECT 3: XML FOR A
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CHAPTER 29 ■ PROJECT 10: DO-IT-YO
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APPENDIX A ■ ■ ■ The Short Ve
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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 579 cmd module 252, 501 Cm
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■INDEX 581 get method 74-75 has_k
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■INDEX 583 ■F Factory class twi
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■INDEX 585 finding conflicts 197
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■INDEX 587 initialization 38 nami
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■INDEX 589 localtime function tim
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■INDEX 591 nesting blocks 88 Netw
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■INDEX 593 playful programming 38
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■INDEX 595 Python C API 365 hand-
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■INDEX 597 ■S safe_substitute m
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■INDEX 599 split function re modu
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■INDEX 601 TestCase class methods
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■INDEX 603 further exploration 47
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