Python trouble

rondo12 · 07-18-2006, 08:58 AM

Hi. I'm having some trouble running Python on my DamnSmallLinux machine. As far as I can tell, there are no problems with the main Linux install, but obviously there must be something wrong with the way I've configured Python. Just can't think what.

The Python interpreter path is in bootlocal.sh, so I can run Python interpreter from any directory. All permissions are allowed for all users. BUT, I can't run scripts. I set my script and also the Python interpreter to chmod 755, but it doesn't work. The error message is:

Bad interpreter: Permission denied

The command-line interpreter works fine by itself: it's just scripts it can't seem to execute. It doesn't even get to the first line in the script. It just returns the error message above.

So I checked my fstab, and yes on all partitions "exec" is set, and so is "users". So I assume fstab settings aren't the problem. The Python 2.3 package I'm using is the standard stable one from my distro's official website, so obviously it can't be a line-endings problem from a package put together under Windows.

Any ideas?

jayemef · 07-18-2006, 09:22 AM

When running your scripts, are you using

Code:

$ python filename.py

or are you relying on the shebang by using

Code:

$ ./filename.py

Your error sounds like you are using the wrong shebang, and thus coming up with the wrong interpreter. I usually use

Code:

#!/usr/bin/env python

The command which python will tell you exactly where your interpreter is located.

Also, for future reference, you can use apt to install python in DSL:

Code:

$ sudo dpkg-restore
$ sudo apt-get update
$ sudo apt-get install python

There should be a way to install it via DSL's own tools, but I've never taken the time to learn how.

rondo12 · 07-18-2006, 11:15 AM

Thanks jayemef. Python is located in opt/python/bin, and to run my scripts I just enter the name of the script, e.g. script.py into bash. The first line of the script is:

#!/opt/python/bin python

I didn't use apt-get to install this Python, because the DSL computer is not connected to the internet. I instead got the Python tarball from the DSL website (from distro, ibiblio):

pub/linux/distributions/damnsmall/mydsl/system/

As it didn't have the .dsl extension, it was not possible to use the MyDSL facility to install this app. So I just put it in /opt so that it would be included as a startup program. Do you think this could be the problem?

jayemef · 07-18-2006, 11:42 AM

Nope, shouldn't be a problem -- particularly if you can use python in interactive mode. Try changing your shebang to

Code:

#!/opt/python/bin/python

and see if that helps.

rondo12 · 07-18-2006, 05:05 PM

Wow!! It works! Been spending 3 days tearing my hair out over that: and it turns out it was fixable with a single slash. Great website, this. Thanks Jayemef.

Quote:

Originally Posted by jayemef

Nope, shouldn't be a problem -- particularly if you can use python in interactive mode. Try changing your shebang to

Code:

#!/opt/python/bin/python

and see if that helps.