Re: Coming from Perl
Bryan Olson wrote: Amer Neely wrote: I don't have shell access but I can run 'which python' from a Perl script, and I will try the different shebang line you suggested. And after trying it, Amer Neely reported: I tried `which python` and `whereis python` and got 0 back as a result. So it seems Python is not installed at all. Probably right, but just to be thorough... Since you do not have shell access, I'm guessing you are running these within a Perl cgi script, and getting the results via a browser. Is that right? Yes. Can you backtick other commands? What do you get if you run `which perl` the same way? How about `whoami`, `whereis sh`, and `which nosuchthingas5748614`? Can you list /, /bin and /usr/bin? I just looked at my code and tried something else: @SysCmd=which python; system(@SysCmd); and it came back /usr/local/bin/python How did you learn that this system could run your Perl scripts? Can that source give us anything to go on here? If Python is not installed, do you have some avenue for requesting it? We're down to long shots. Still, hosts that support Perl but will not support Python are getting to be the rare. I've asked my host to put in a request for it. So it seems python IS installed, but not where I thought it was. I just tried my script with the new path, but still got a 500 server error. Can I trap errors to a file locally? -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Paddy wrote: On Sep 13, 1:30 am, Amer Neely [EMAIL PROTECTED] wrote: I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. Hi Amer, Just as an aside, you might find this helpful: http://wiki.python.org/moin/PerlPhrasebook It has perl code with python equivalents/notes. Hello Paddy, Thanks for that link - it does look quite useful. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl - SOLVED
I V wrote: On Thu, 13 Sep 2007 23:49:32 -0400, Amer Neely wrote: In trying to track down why this script would not run on my host, it has to come to light that Python is installed, however the Apache module is not. So, short story is - I was flogging a dead horse. Which Apache module? You don't need any special modules (just the regular CGI one) to use python in a CGI script. That is an interesting observation. It does run under my Apache + Win2K at home, with no special configuration by me. All I'm going on is what the techs told me. So, you think it may be something else? I've changed and even eliminated the end-of-line chars in my print statements. Another poster (Bryan Olson) has suggested a few things to try as well so I will try those. I don't have shell access though, so the best I can do is execute shell commands from a Perl script. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Bryan Olson wrote: Amer Neely wrote: This seems to indicate that maybe my host needs to configure Apache to run python scripts? But I didn't need to do anything with mine. Another possibility: If it works on Windows but not Unix, check the end-of-line characters. Windows ends each line with the two character sequence carriage-return + newline, which in Python is \r\n. Unix uses newline alone, \n. Most Unixies will choke on a #! line with a carriage return. The Python interpreter will accept source files with either end-of-line on either system, but of course you'll not get that far unless the operating system respects the shebang line. Maybe you already checked that. Hmmm...other possiblities... Do you have shell access? Can you executing it directly from the shell? Do you get a Python error, or some other? Did you: chmod ugo+rx yourscript Is Python in /usr/bin? What does which python say? Generally, most experts seem to prefer: #!/usr/bin/env python You might try changing the the extension of your script from .py to .cgi. Windows uses the .py to choose the executable, but Unix does not care; it used the shebang line. Hmmm. These are interesting suggestions. Especially in light of a new wrinkle pointed out by [IV]. That being the script runs fine under my Apache at home with no special modules loaded. I don't have shell access but I can run 'which python' from a Perl script, and I will try the different shebang line you suggested. Thanks for the suggestions. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Bryan Olson wrote: Amer Neely wrote: This seems to indicate that maybe my host needs to configure Apache to run python scripts? But I didn't need to do anything with mine. Another possibility: If it works on Windows but not Unix, check the end-of-line characters. Windows ends each line with the two character sequence carriage-return + newline, which in Python is \r\n. Unix uses newline alone, \n. Most Unixies will choke on a #! line with a carriage return. The Python interpreter will accept source files with either end-of-line on either system, but of course you'll not get that far unless the operating system respects the shebang line. Maybe you already checked that. Hmmm...other possiblities... Do you have shell access? Can you executing it directly from the shell? Do you get a Python error, or some other? Did you: chmod ugo+rx yourscript Is Python in /usr/bin? What does which python say? Generally, most experts seem to prefer: #!/usr/bin/env python You might try changing the the extension of your script from .py to .cgi. Windows uses the .py to choose the executable, but Unix does not care; it used the shebang line. I tried `which python` and `whereis python` and got 0 back as a result. So it seems Python is not installed at all. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
TheFlyingDutchman wrote: On Sep 12, 5:30 pm, Amer Neely [EMAIL PROTECTED] wrote: I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. -- Amer Neely w:www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! I am not sure if this is what you are looking for, but Python has a special string with 3 quotes that I believe duplicates part of the functionality of a here document: myHmtlHeader = head attribute = abc titleMy Page/title /head print myHtmlHeader outputs: head attribute=abc titleMy Page/title /head Well, I have checked everything I can but I'm getting '500 Internal Server Error'. The log files aren't helpful: [Thu Sep 13 03:43:00 2007] [error] [client 24.235.184.39] Premature end of script headers: /home/softouch/public_html/cgi-bin/scratch/hello.py I can't even get it to run on my home PC running Apache + Win2K. Same error. My script: #!/usr/bin/python import cgitb; cgitb.enable(display=0, logdir=.) import sys sys.stderr = sys.stdout print Content-Type: text/html print print html body div align=centerfont style=font-family:verdana; size:18pxHello from Python/font/div br Goodbye. /body /html -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Amer Neely wrote: TheFlyingDutchman wrote: On Sep 12, 5:30 pm, Amer Neely [EMAIL PROTECTED] wrote: I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. -- Amer Neely w:www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! I am not sure if this is what you are looking for, but Python has a special string with 3 quotes that I believe duplicates part of the functionality of a here document: myHmtlHeader = head attribute = abc titleMy Page/title /head print myHtmlHeader outputs: head attribute=abc titleMy Page/title /head Well, I have checked everything I can but I'm getting '500 Internal Server Error'. The log files aren't helpful: [Thu Sep 13 03:43:00 2007] [error] [client 24.235.184.39] Premature end of script headers: /home/softouch/public_html/cgi-bin/scratch/hello.py I can't even get it to run on my home PC running Apache + Win2K. Same error. My script: #!/usr/bin/python import cgitb; cgitb.enable(display=0, logdir=.) import sys sys.stderr = sys.stdout print Content-Type: text/html print print html body div align=centerfont style=font-family:verdana; size:18pxHello from Python/font/div br Goodbye. /body /html I should have added that it runs from the command line OK. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Ben Finney wrote: Amer Neely [EMAIL PROTECTED] writes: Well, I have checked everything I can but I'm getting '500 Internal Server Error'. This is the HTTP response code saying that the program that should have served the response document instead exited with an error. To debug, you should first run the program (or at least the part that you're trying to implement) *outside* the context of a web server. Do it at a command line, and any errors will show up as exception tracebacks. Only when you have something that performs correctly outside a web server context should you consider how to wrap it in that new (harder-to-debug) context. That is where I'm stuck. It runs fine on my home computer, but I don't have shell access to my hosted site. Can you or anyone see anything in the posted code that might be the cause? Why is it so much harder to debug? There is no syntax error that I can tell. I've set the file permissions to rwxr-xr-x. I've printed the correct content type. It's a simple print statement, as per several examples I've seen. Is it an Apache thing? I've not seen any mention in the documentation on that. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Richie Hindle wrote: [Amer] Can you or anyone see anything in the posted code that might be the cause? #!/usr/bin/python import cgitb; cgitb.enable(display=0, logdir=.) import sys sys.stderr = sys.stdout print Content-Type: text/html print My guess would be that you don't have cgitb in your server environment, or that you have a bogus one. Rearrange things like this: #!/usr/bin/python print Content-Type: text/html print import sys sys.stderr = sys.stdout import cgitb; cgitb.enable(display=0, logdir=.) Nope. Same error. Is cgitb not in the standard distribution? Is it needed to print HTML? On my home PC I changed the Apache error logging to 'debug' and got this nugget: [Thu Sep 13 04:16:03 2007] [error] [client 0.0.0.0] (OS 2)The system cannot find the file specified. : couldn't create child process: 720002: hello.py I suspect it would be similar on my hosting server. Is this saying it can't find hello.py or one of the modules? -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Richie Hindle wrote: [Amer] #!/usr/bin/python [...] On my home PC [...] [Thu Sep 13 04:16:03 2007] [error] [client 0.0.0.0] (OS 2)The system cannot find the file specified. That's because on your home PC Python is somewhere like C:\Python25\python.exe, not /usr/bin/python. Are you sure /usr/bin/python is correct for your hosting environment? It's my understanding that the Windows shell doesn't pay much attention to the shebang line if the file type is associated with the proper application. But I tried your suggestion and got the same results. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Amer Neely wrote: Richie Hindle wrote: [Amer] #!/usr/bin/python [...] On my home PC [...] [Thu Sep 13 04:16:03 2007] [error] [client 0.0.0.0] (OS 2)The system cannot find the file specified. That's because on your home PC Python is somewhere like C:\Python25\python.exe, not /usr/bin/python. Are you sure /usr/bin/python is correct for your hosting environment? It's my understanding that the Windows shell doesn't pay much attention to the shebang line if the file type is associated with the proper application. But I tried your suggestion and got the same results. My BAD! I changed the shebang all right, but entered a typo. With the correct path it did work just fine. So, perhaps the path to python on my host is wrong? I got that one right from the techs. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Tim Golden wrote: Amer Neely wrote: Richie Hindle wrote: [Amer] #!/usr/bin/python [...] On my home PC [...] [Thu Sep 13 04:16:03 2007] [error] [client 0.0.0.0] (OS 2)The system cannot find the file specified. That's because on your home PC Python is somewhere like C:\Python25\python.exe, not /usr/bin/python. Are you sure /usr/bin/python is correct for your hosting environment? It's my understanding that the Windows shell doesn't pay much attention to the shebang line if the file type is associated with the proper application. But I tried your suggestion and got the same results. See my reply to this post - I had a typo in the shebang line and it now works on my home PC. The Windows shell doesn't, but Apache does. (Haven't followed this thread closely, but I seem to remember it has to do with running CGI scripts). This seems to indicate that maybe my host needs to configure Apache to run python scripts? But I didn't need to do anything with mine. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl - SOLVED
Amer Neely wrote: I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. In trying to track down why this script would not run on my host, it has to come to light that Python is installed, however the Apache module is not. So, short story is - I was flogging a dead horse. Sorry for raising a non-issue folks. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Coming from Perl
I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
Ben Finney wrote: Amer Neely [EMAIL PROTECTED] writes: A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I'm not sure exactly what behaviour you want, but Python accepts literal strings to be triple-quoted (i.e. delimited by pairs or ''' pairs), which allows you to freely use literal line feed and quote characters inside that string. URL:http://docs.python.org/ref/strings.html I saw that and I guess that is the closest thing. In Perl I can do .. print EndHTML; html body Hello /body /html EndHTML In this case 'EndHTML' is a label, and I'm telling perl to print everything as is up to that label. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
Re: Coming from Perl
TheFlyingDutchman wrote: On Sep 12, 5:30 pm, Amer Neely [EMAIL PROTECTED] wrote: I'm a complete newbie with Python, but have several years experience with Perl in a web environment. A question I have, if someone here is familiar with Perl, does Python have something like Perl's 'here document'? I've just searched and read some postings on generating HTML but they all seem to refer to various template utilities. Is this the only way, or am I missing something? I'm used to generating X/HTML by hand, which makes the here document in Perl ideal for me. Also, many times a client already existing HTML code that I can use in a script. -- Amer Neely w:www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! I am not sure if this is what you are looking for, but Python has a special string with 3 quotes that I believe duplicates part of the functionality of a here document: myHmtlHeader = head attribute = abc titleMy Page/title /head print myHtmlHeader outputs: head attribute=abc titleMy Page/title /head Yep, I think that is the way I will have to go. Thanks. -- Amer Neely w: www.webmechanic.softouch.on.ca/ Perl | MySQL programming for all data entry forms. Others make web sites. We make web sites work! -- http://mail.python.org/mailman/listinfo/python-list
