Programming Forums > Script Programming > Python

Sane · Jan 31st, 2008, 12:31 PM

If hello world is displayed successfully, then everything is running fine. Your other scripts must not be consistent with the working script, or still contain errors.

Post the hello world script. Then post a simple script that you can't get working.

Swan · Feb 2nd, 2008, 12:31 AM

I have attached the form-sample.zip ( python script for making forms) which i am trying to use. But on running it, the browser shows the error page, with statement that there is some error in the cgi script.

The hello-world.py is simply :

print "hello world"

And that runs successfully.

Sane · Feb 2nd, 2008, 8:09 AM

The zip file is corrupted.

But 45 kb? There are way too many reasons why such a large Python script won't work first shot. Either get a smaller Python script to work. Or build an understanding of Python so you can debug it correctly. Post it again within [code][/code] tags please if you don't mind more unhelpful replies.

Swan · Feb 14th, 2008, 11:25 PM

No. the zip file is working. I tested it.

But I tried this also :

class Eb_db:
def __init__(self):
try:
connection = MySQLdb.connect(host="localhost",
user="swan", passwd="swan", db="swan" )
cursor = connection.cursor()
cursor.execute( "SELECT * FROM Table1 " )
except MySQLdb.OperationalError, message:
errorMessage = "Error %d:\n%s" % (message[ 0 ], message[ 1 ] )
return
else:
self.data = cursor.fetchall()   
self.fields = cursor.description   
cursor.close()  
connection.close()

( From tutorial : http://www.serpia.org/blog/2007/oct/...-mysql-python/ )

But the code doesnot work. And most frustating is the fact that no error is generated. It just shows the same black and white page saying some error has occured in the cgi script. Where the error occured, What is the type of error, Why the error occured....Nothing.

Sane · Feb 15th, 2008, 3:29 PM

Firstly: Refer to my very first reply in this thread. Does your code begin with, and follow, that template?

Secondly: Does the code at least compile in your local Python interpreter?

Thirdly: Please wrap your code in [code][/code] tags next time.

Fourthly: Your code does not even have a single print statement. How do you expect it to make visible output? Do you even know how to program in Python?

Swan · Feb 16th, 2008, 12:19 AM

Quote:

Originally Posted by Sane

Firstly: Refer to my very first reply in this thread. Does your code begin with, and follow, that template?

Secondly: Does the code at least compile in your local Python interpreter?

Thirdly: Please wrap your code in [code][/code] tags next time.

Fourthly: Your code does not even have a single print statement. How do you expect it to make visible output? Do you even know how to program in Python?

Ok so according to you ,i should test this :

(Toggle Plain Text)

#!c:/python24/python

import cgitb
import cgi
cgitb.enable()

print "Content-type: text/html\r"
print "\r"

class Eb_db:
def __init__(self):
try:
connection = MySQLdb.connect(host="localhost",
user="swan", passwd="swan", db="swan" )
cursor = connection.cursor()
cursor.execute( "SELECT * FROM Table1 " )
except MySQLdb.OperationalError, message:
errorMessage = "Error %d:\n%s" % (message[ 0 ], message[ 1 ] )
return
else:
self.data = cursor.fetchall()&nbsp;&nbsp;&nbsp;
self.fields = cursor.description&nbsp;&nbsp;&nbsp;
cursor.close()&nbsp;&nbsp;
connection.close()

I agree, i am new to python, but i know php, and can run the same program in php.
Yah ! the code doesnot output anything, but atleast doesnot give any error when a similar program is made in php.

Sane · Feb 16th, 2008, 9:17 AM

In CGI-Land, not sending data back to the user is the equivilent of an error. What could appear to be an error is just a lack of you sending the appropriate header information at the top with:

(Toggle Plain Text)

print "Content-type: text/html\r"
print "\r"

Also, look at the "Hello World" script you said you were able to get working. It should have a line at the top that's similar or equal to my first line. Use the hello world's script first line instead of mine, because it knows the correct location of your Python interpreter.

Swan · Feb 17th, 2008, 9:11 PM

Quote:

Originally Posted by Sane

In CGI-Land, not sending data back to the user is the equivilent of an error. What could appear to be an error is just a lack of you sending the appropriate header information at the top with:

(Toggle Plain Text)

print "Content-type: text/html\r"
print "\r"

Also, look at the "Hello World" script you said you were able to get working. It should have a line at the top that's similar or equal to my first line. Use the hello world's script first line instead of mine, because it knows the correct location of your Python interpreter.

No...! it doesnot work

. And the local python interpreter gives no error.

An another working script is :

(Toggle Plain Text)

print "Content-type: text/html\n\n"
print "<html><head><link href=\"../styles.css\" rel=\"stylesheet\" type=\"text/css\"></head><body>"
import os, sys
print "&nbsp;<br><h1>Python %s</h1>" % sys.version
print "</body></html>"

It provides the output :

Python 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC v.1200 32 bit (Intel)]

Sane · Feb 17th, 2008, 10:06 PM

Okay, so it looks like you don't need that first line. It should be obvious to try this as the start of your code then:

(Toggle Plain Text)

import cgitb
import cgi
cgitb.enable()

print "Content-type: text/html\n\n"

To replace what I proposed earlier:

(Toggle Plain Text)

#!c:/python24/python

import cgitb
import cgi
cgitb.enable()

print "Content-type: text/html\r"
print "\r"

Swan · Feb 18th, 2008, 10:18 PM

But you can see, i don't need these :

Quote:

import cgitb
import cgi
cgitb.enable()

So why write them ?

Jan 31st, 2008, 12:31 PM	#11
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,835 Rep Power: 5	Re: Running python scripts on localhost If hello world is displayed successfully, then everything is running fine. Your other scripts must not be consistent with the working script, or still contain errors. Post the hello world script. Then post a simple script that you can't get working.

Feb 2nd, 2008, 8:09 AM	#13
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,835 Rep Power: 5	Re: Running python scripts on localhost The zip file is corrupted. But 45 kb? There are way too many reasons why such a large Python script won't work first shot. Either get a smaller Python script to work. Or build an understanding of Python so you can debug it correctly. Post it again within [code][/code] tags please if you don't mind more unhelpful replies.

Feb 14th, 2008, 11:25 PM	#14
Swan Programmer Join Date: Jan 2008 Posts: 31 Rep Power: 0	Re: Running python scripts on localhost No. the zip file is working. I tested it. But I tried this also : class Eb_db: def __init__(self): try: connection = MySQLdb.connect(host="localhost", user="swan", passwd="swan", db="swan" ) cursor = connection.cursor() cursor.execute( "SELECT * FROM Table1 " ) except MySQLdb.OperationalError, message: errorMessage = "Error %d:\n%s" % (message[ 0 ], message[ 1 ] ) return else: self.data = cursor.fetchall()    self.fields = cursor.description    cursor.close()   connection.close() ( From tutorial : http://www.serpia.org/blog/2007/oct/...-mysql-python/ ) But the code doesnot work. And most frustating is the fact that no error is generated. It just shows the same black and white page saying some error has occured in the cgi script. Where the error occured, What is the type of error, Why the error occured....Nothing.

Feb 15th, 2008, 3:29 PM	#15
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,835 Rep Power: 5	Re: Running python scripts on localhost Firstly: Refer to my very first reply in this thread. Does your code begin with, and follow, that template? Secondly: Does the code at least compile in your local Python interpreter? Thirdly: Please wrap your code in [code][/code] tags next time. Fourthly: Your code does not even have a single print statement. How do you expect it to make visible output? Do you even know how to program in Python? __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data Last edited by Sane; Feb 15th, 2008 at 3:42 PM.

Feb 16th, 2008, 9:17 AM	#17
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,835 Rep Power: 5	Re: Running python scripts on localhost In CGI-Land, not sending data back to the user is the equivilent of an error. What could appear to be an error is just a lack of you sending the appropriate header information at the top with: (Toggle Plain Text) print "Content-type: text/html\r" print "\r" print "Content-type: text/html\r" print "\r" Also, look at the "Hello World" script you said you were able to get working. It should have a line at the top that's similar or equal to my first line. Use the hello world's script first line instead of mine, because it knows the correct location of your Python interpreter. __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

Feb 17th, 2008, 10:06 PM	#19
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,835 Rep Power: 5	Re: Running python scripts on localhost Okay, so it looks like you don't need that first line. It should be obvious to try this as the start of your code then: (Toggle Plain Text) import cgitb import cgi cgitb.enable() print "Content-type: text/html\n\n" import cgitb import cgi cgitb.enable() print "Content-type: text/html\n\n" To replace what I proposed earlier: (Toggle Plain Text) #!c:/python24/python import cgitb import cgi cgitb.enable() print "Content-type: text/html\r" print "\r" #!c:/python24/python import cgitb import cgi cgitb.enable() print "Content-type: text/html\r" print "\r" __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

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Programming Forums > Script Programming > Python

Running python scripts on localhost