Programming Forums > Script Programming > Python

Sane · Aug 2nd, 2005, 6:51 PM

Keeping Your Publicly Released Programs Automatically Updated

Program: This will be run with Python once an update has or hasn't occured.

Web Directory: The Update Instructions and Contents are here.

Version Data: Contains a number with the current version number, in the same folder as the program and this file.

Update Instuctions: Contains a number which if higer then the version number, will process all the listed files underneath to current working directory.

Version Data:

(Toggle Plain Text)

Update Instructions:

(Toggle Plain Text)

2
example_9.py
Battle%20System.py

Output:

(Toggle Plain Text)

Will ask if the user wants an update.
Will copy all the files listed to the current working directory.
Will execute main.py.

It's good for situations where you've released your program to the public, but notice a bug you want to fix. If this is the program they run to execute the program, it will check if an update is needed, and then update the files however you tell it to.

I think it's a good idea at least.

Cerulean · Aug 4th, 2005, 12:04 PM

Yeh, nice script. Updates are pretty sweet.
Bear in mind using an except statement to except any error is really bad practice. Only except the errors you know that arise, or at least put in a print statement that will print the kind of exception that you received, the errno, and the traceback.

Sane · Aug 4th, 2005, 7:12 PM

No the except is there in case they are not connected to the internet, or there is no update accessable at the given time. In which case it skips right to your program without worrying about an update.

Cerulean · Aug 5th, 2005, 7:12 AM

Then you should except whatever error is thrown in the case of you not being connected to the internet or there being no update accessible at the given time.

Sane · Aug 5th, 2005, 9:28 AM

I did.

Cerulean · Aug 6th, 2005, 8:19 AM

No, you're catching every exception that may get thrown (KeyboardError, MemoryError, IOError, whatever).
How can I explain it... it's kind of like you doing:

(Toggle Plain Text)

rm *

when you only want to do

(Toggle Plain Text)

rm *.txt *.rtf

Sane · Aug 6th, 2005, 1:47 PM

Yes, I do indeed want to catch all those exceptions and go straight to the program.

Basically I want every error caught and excepted to the main program. Everything except for the condition that an update may be there with a higher version number.

Cerulean · Aug 6th, 2005, 3:02 PM

Quote:

Everything except for the condition that an update may be there with a higher version number.

And what happens when there is an update available with a higher version number, but some other bug that you missed the first time round stops the update from happening and you do not realise, because you've told the interpreter "Hey, I don't care what error happens, however critical it is, just forget it"? Say, for example, the update instruction filename changes. You should cater for each individual error that might occur to provide the most graceful method for handling it, not just a lazy all-in-one solution that isn't even a solution.

I'm also a little confused why you have this:

(Toggle Plain Text)

    for a in range(len(x)):
        try:x[a]=x[a].replace('\r','')
        except:pass
        
        try:x[a]=x[a].replace('\n','')
        except:pass

Why the excepts? x should always be a list of strings (or an empty list), and you're within the list's bounds at all times... so what errors are you excepting?

Sane · Aug 6th, 2005, 3:08 PM

In case there is no '\r' or '\n' ...

Cerulean · Aug 6th, 2005, 3:57 PM

No exceptions are raised by replace. There'll just be no replacements.

Aug 2nd, 2005, 6:51 PM	#1
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,840 Rep Power: 5	Keeping Your Publicly Released Programs... Keeping Your Publicly Released Programs Automatically Updated Program: This will be run with Python once an update has or hasn't occured. Web Directory: The Update Instructions and Contents are here. Version Data: Contains a number with the current version number, in the same folder as the program and this file. Update Instuctions: Contains a number which if higer then the version number, will process all the listed files underneath to current working directory. Version Data: (Toggle Plain Text) 1 1 Update Instructions: (Toggle Plain Text) 2 example_9.py Battle%20System.py 2 example_9.py Battle%20System.py Output: (Toggle Plain Text) Will ask if the user wants an update. Will copy all the files listed to the current working directory. Will execute main.py. Will ask if the user wants an update. Will copy all the files listed to the current working directory. Will execute main.py. It's good for situations where you've released your program to the public, but notice a bug you want to fix. If this is the program they run to execute the program, it will check if an update is needed, and then update the files however you tell it to. I think it's a good idea at least.

Aug 5th, 2005, 9:28 AM	#5
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,840 Rep Power: 5	I did. __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

Aug 6th, 2005, 8:19 AM	#6
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	No, you're catching every exception that may get thrown (KeyboardError, MemoryError, IOError, whatever). How can I explain it... it's kind of like you doing: (Toggle Plain Text) rm * rm * when you only want to do (Toggle Plain Text) rm .txt .rtf rm .txt .rtf

Aug 6th, 2005, 1:47 PM	#7
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,840 Rep Power: 5	Yes, I do indeed want to catch all those exceptions and go straight to the program. Basically I want every error caught and excepted to the main program. Everything except for the condition that an update may be there with a higher version number. __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

Aug 6th, 2005, 3:08 PM	#9
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,840 Rep Power: 5	In case there is no '\r' or '\n' ... __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

Aug 4th, 2005, 12:04 PM	#2
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	Yeh, nice script. Updates are pretty sweet. Bear in mind using an except statement to except any error is really bad practice. Only except the errors you know that arise, or at least put in a print statement that will print the kind of exception that you received, the errno, and the traceback.

Aug 4th, 2005, 7:12 PM	#3
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,840 Rep Power: 5	No the except is there in case they are not connected to the internet, or there is no update accessable at the given time. In which case it skips right to your program without worrying about an update.

Aug 5th, 2005, 7:12 AM	#4
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	Then you should except whatever error is thrown in the case of you not being connected to the internet or there being no update accessible at the given time.

Aug 6th, 2005, 3:57 PM	#10
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	No exceptions are raised by replace. There'll just be no replacements.

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Programming Forums > Script Programming > Python

Keeping Your Publicly Released Programs...