Problem with Python

[tseliot]

Hi, I'm trying to write a little script in Python which checks Ubuntu's version and prints the output.

I have written this:


#/usr/bin/python
import os, sys

def archit_system():
release = os.system('cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//')
if release == '5.10':
print release + 'ubuntu_breezy'

elif release == '6.06':
print release + 'ubuntu_dapper'

else:
print "Your Operative System does not seem to be supported by Envy"

print release

archit_system

If I run the script in the following way it doesn't work:

python prova.py


I'm a newbie in Python. Please, tell me what's wrong.


Thanks in advance

[agger]

Well, the reason it doesn't seem to run is that you need to call the archit-system function.


archit-system

is an expression which denotes the function "archit-system" - it doesn't call the function. If you replace that line with


archit-system()

you get some output.
However, the output I get is this:



cat: /var/log/installer/lsb-release: No such file or directory
Your Operative System does not seem to be supported by Envy
0

So /var/log/installer also doesn't seem to be the right place to look for this.

[Thirsteh]

nevermind :)

[tseliot]

Well, the reason it doesn't seem to run is that you need to call the archit-system function.


archit-system

is an expression which denotes the function "archit-system" - it doesn't call the function. If you replace that line with


archit-system()

you get some output.
My bad ;)

[QUOTE=agger;1313407]However, the output I get is this:


cat: /var/log/installer/lsb-release: No such file or directory
Your Operative System does not seem to be supported by Envy
0

So /var/log/installer also doesn't seem to be the right place to look for this.

If I type this command in Terminal:

cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//

it returns:

6.06

Therefore the command is right.

Any ideas?

[tseliot]

If I use the script in Python I get this:

$ python prova.py
6.06
Your Operative System does not seem to be supported by Envy
0

[agger]

Maybe for some reason I didn't get a file called "lsb-release" during the install process?

The "var" hierarchy is for transient stuff like log files anyway, so most of it may usually be safely deleted - which means that you can't count on configuration data to stay there in the general case.

The reason I don't tell you what's the right place to look, then, is I don't know - but I suspect somewhere in /etc.

[Lord Illidan]

If I use the script in Python I get this:

$ python prova.py
6.06
Your Operative System does not seem to be supported by Envy
0

I am not super at python, but it seems to me that this is the problem:


release = os.system('cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//')

Instead of putting the result of the command in release, it justs outputs the result of the command to the terminal.

[tseliot]

I am not super at python, but it seems to me that this is the problem:


release = os.system('cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//')

Instead of putting the result of the command in release, it justs outputs the result of the command to the terminal.

And how could I solve it?

[tseliot]

Maybe for some reason I didn't get a file called "lsb-release" during the install process?

The "var" hierarchy is for transient stuff like log files anyway, so most of it may usually be safely deleted - which means that you can't count on configuration data to stay there in the general case.
Ok, I'll change that when the biggest problem is solved

[tseliot]

Ok, maybe this recipe can help me :D :
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52296

[Wallakoala]

umm...when I run
cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//

the output is 5.10

but I am running dapper...

this is weird...

[Lord Illidan]

umm...when I run
cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//
the output is 5.10

but I am running dapper...

this is weird...

Did you install dapper or upgraded from breezy?

[asimon]

Why is /var/log/installer/lsb-release checked instead of /etc/lsb-release?

On many systems these files are different!

[tseliot]

I've found out that the right command is:

lsb_release -c

which gives me:

$ lsb_release -c
Codename: dapper

[tseliot]

Hi, I'm trying to write a little script in Python which checks Ubuntu's version and prints the output.

I have written this:


#/usr/bin/python
import os, sys

def archit_system():
release = os.system('cat /var/log/installer/lsb-release | grep RELEASE | sed s/.*=//')
if release == '5.10':
print release + 'ubuntu_breezy'

elif release == '6.06':
print release + 'ubuntu_dapper'

else:
print "Your Operative System does not seem to be supported by Envy"

print release

archit_system

If I run the script in the following way it doesn't work:

python prova.py


I'm a newbie in Python. Please, tell me what's wrong.


Thanks in advance

And the solution to my question is.....

this function (which I saw in EasyUbuntu):


def codename():
p = os.popen("lsb_release -c")
try:
codename = p.readline().strip()
tokens = codename.split("\t")
finally:
p.close()
return tokens[-1].lower()