Re: [Tutor] Exception and sys.exit() in a cgi script
I was wrong! Now it works fine! Thank you! I have another similar script where the print HTTP headers statement is in a previous line... In this one it is not the case. Sorry for my inconvenience! Paulino Citando wesley chun [EMAIL PROTECTED]: paulino, mike and michael are correct. (...) -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. import cgitb; cgitb.enable() That spits errors to the web page which is great for debugging cgi scripts. Thats not the point (sorry). when all the values are provided in the form (no excetion is raised) it runs as expected! The point is when one of the values ano, conta is missing in the form, I want the error message to be shown on the browser, and the script to stop running. When there is an exception, the script actually stops running, but no message is sent to the browser. paulino, mike and michael are correct. i know your script runs fine when the form fields are entered. the output is quite different tho. as alan and everyone has alluded to, sending output to the screen is different than sending to a browser there is more work in order to get the text to it. when you display to the screen, it is a direct connect to the standard output (not nec stdout) display, which is your monitor. when you send things to a browser, you have to remember that web pages flow on the network (even on the same machine). the protocol that is used is called HTTP, and as the writer of software that runs on the server side, you need to communicate to the client using that protocol properly to the client (otherwise that defeats the purpose of even *having* a protocol). the headers which michael has mentioned in his above post are the required part of the HTTP protocol that must come before any HTML is sent (by your script). review the recommended documents to get a good idea of how CGI works with HTTP and HTML, and then you will be ok. here is a Core Tip i placed on p.882 in the web programming chapter my book (see below): CORE TIP: HTTP headers separate from HTML One thing that always nails CGI beginners is that when sending results back to a CGI script, it must return the appropriate HTTP headers first before any HTML. Furthermore, to distinguish between these headers and the resulting HTML, several NEWLINE characters must be inserted between both sets of data, as in line 5 of our friends1.py example, as well as for the code in the remaining part of the chapter. if you happen to have access to a copy of the book, that chapter will really help you really understand how to write a CGI script successfully. basically, my summary is this: you will see a lot of 500/ISE errors and cgitb is your friend. :-) hope this helps! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
On 10/21/06, Paulino [EMAIL PROTECTED] wrote: Mike Hansen Mike.Hansen at atmel.com Mon Oct 16 18:43:29 CEST 2006 This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form[ano].value 5 conta=form[conta].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. What's wrong here?___ Tutor maillist - Tutor at python.org http://mail.python.org/mailman/listinfo/tutor I'm catching up on the weekend's tutor messages.import cgitb; cgitb.enable()That spits errors to the web page which is great for debugging cgiscripts.I think you needprint Content-Type: text/html\n\n http://docs.python.org/lib/cgi-intro.html http://docs.python.org/lib/node560.html Mike Thats not the point (sorry). when all the values are provided in the form (no excetion is raised) it runs as expected! The point is when one of the values ano, conta is missing in the form, I want the error message to be shown on the browser, and the script to stop running. When there is an exception, the script actually stops running, but no message is sent to the browser.Actually, this is the point. The first lines of output from your CGI script, even on an error, needs to be header information to the web server and to the web browser, then a blank line, and then the content to be displayed (text, html, image, etc.). If you don't include the print 'Content-type: text/html\n' line that Mike suggests, then your HTML will be swallowed by the system as configuration information (and erroneous information at that). Mike suggested some webpages to review. It might be good to pour over them to learn more about the CGI protocols. -Arcege-- There's so many different worlds,So many different suns. And we have just one world,But we live in different ones. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
Mike Hansen Mike.Hansen at atmel.com Mon Oct 16 18:43:29 CEST 2006 This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form["ano"].value 5 conta=form["conta"].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. What's wrong here? ___ Tutor maillist - Tutor at python.org http://mail.python.org/mailman/listinfo/tutor I'm catching up on the weekend's tutor messages. import cgitb; cgitb.enable() That spits errors to the web page which is great for debugging cgi scripts. I think you need print "Content-Type: text/html\n\n" http://docs.python.org/lib/cgi-intro.html http://docs.python.org/lib/node560.html Mike Thats not the point (sorry). when all the values are provided in the form (no excetion is raised) it runs as expected! The point is when one of the values "ano", "conta" is missing in the form, I want the error message to be shown on the browser, and the script to stop running. When there is an exception, the script actually stops running, but no message is sent to the browser. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paulino Sent: Sunday, October 15, 2006 10:10 AM To: tutor@python.org Subject: [Tutor] Exception and sys.exit() in a cgi script This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form[ano].value 5 conta=form[conta].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. What's wrong here? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor I'm catching up on the weekend's tutor messages. import cgitb; cgitb.enable() That spits errors to the web page which is great for debugging cgi scripts. I think you need print Content-Type: text/html\n\n Before your print html statement. http://docs.python.org/lib/cgi-intro.html http://docs.python.org/lib/node560.html Mike ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Exception and sys.exit() in a cgi script
This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form[ano].value 5 conta=form[conta].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. What's wrong here? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
Hi Paulino, This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form[ano].value 5 conta=form[conta].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. Can you tell us a bit more about the set up? What OS? What web server? Can you get any other python CGI scripts running correctly? If I run the script with IDLE, the message is printed and then the script exits. The IDE environment is very different to a web server environment. You should only treat IDLE as a first approximation when developing Web scripts. You can use the OS prompt for a slightly better approximation provided you set some environment variables first, but ultimately you need to test on the web server you will be using. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
Thank you, Yes I have other scripts working fine. The OS is WXP and the server is the python's CGIHTTPserver (for an intranet use only) - Hi Paulino, This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form["ano"].value 5 conta=form["conta"].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. Can you tell us a bit more about the set up? What OS? What web server? Can you get any other python CGI scripts running correctly? If I run the script with IDLE, the message is printed and then the script exits. The IDE environment is very different to a web server environment. You should only treat IDLE as a first approximation when developing Web scripts. You can use the OS prompt for a slightly better approximation provided you set some environment variables first, but ultimately you need to test on the web server you will be using. Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
