Interactive os.environ vs. os.environ in script

**Peter Otten** · Feb 26 '07, 03:45 PM

Re: Interactive os.environ vs. os.environ in script

boris.smirnov@g mail.com wrote:

Hi there,
>
I have a problem with setting environment variable in my script that
uses qt library. For this library I have to define a path to tell the
script whre to find it.
>
I have a script called "shrink_bs_0702 26" that looks like this:
*************** *************** ****
import sys, re, glob, shutil
import os
>
os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'
>
from qt import *
*************** ********
>
When I run this script I get this error:
>
>

>python shrink_bs_07022 6.py

Traceback (most recent call last):
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
File "/path/Linux/python/rh_linux/lib/python2.2/site-packages/
qt.py", line 46, in ?
import libsip
ImportError: libadamsqt.so: cannot open shared object file: No such
file or directory
>
What is important here that when I set this variable interactive in
python session, there is no problem with import.
>

>python

Python 2.2.3 (#1, Aug 8 2003, 08:44:02)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-13)] on linux2
Type "help", "copyright" , "credits" or "license" for more information.

>>>import os

>

>>>import shrink_bs_07022 6

Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
ImportError: No module named qt
>

>>>os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

>

>>>import shrink_bs_07022 6
>>>>

>
Could anybody explain me the logic here? Am I missing something?

Until Python 2.4 a failed import could leave some debris which would make
you think a second import did succeed.

Try

>>import os
>>os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'
>>import shrink_bs_07022 6 # I expect that to fail

in a fresh interpreter to verify that what you see is an artifact of your
test method.

Peter

**boris.smirnov@gmail.com** · Feb 26 '07, 04:05 PM

Re: Interactive os.environ vs. os.environ in script

On Feb 26, 4:32 pm, Peter Otten <__pete...@web. dewrote:

boris.smir...@g mail.com wrote:

Hi there,

>

I have a problem with setting environment variable in my script that
uses qt library. For this library I have to define a path to tell the
script whre to find it.

>

I have a script called "shrink_bs_0702 26" that looks like this:
*************** *************** ****
import sys, re, glob, shutil
import os

>

os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

>

from qt import *
*************** ********

>

When I run this script I get this error:

>

python shrink_bs_07022 6.py

Traceback (most recent call last):
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
File "/path/Linux/python/rh_linux/lib/python2.2/site-packages/
qt.py", line 46, in ?
import libsip
ImportError: libadamsqt.so: cannot open shared object file: No such
file or directory

>

What is important here that when I set this variable interactive in
python session, there is no problem with import.

>

python

Python 2.2.3 (#1, Aug 8 2003, 08:44:02)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-13)] on linux2
Type "help", "copyright" , "credits" or "license" for more information.

>>import os

>

>>import shrink_bs_07022 6

Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
ImportError: No module named qt

>

>>os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

>

>>import shrink_bs_07022 6

>

Could anybody explain me the logic here? Am I missing something?

>
Until Python 2.4 a failed import could leave some debris which would make
you think a second import did succeed.
>
Try
>

>import os
>os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'
>import shrink_bs_07022 6 # I expect that to fail

>
in a fresh interpreter to verify that what you see is an artifact of your
test method.
>
Peter- Hide quoted text -
>
- Show quoted text -

You are right:

python

Python 2.2.3 (#1, Aug 8 2003, 08:44:02)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-13)] on linux2
Type "help", "copyright" , "credits" or "license" for more information.

>>import os

>>os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

>>import shrink_bs_07022 6

Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
ImportError: No module named qt

>>>

OK then I have to reformulate my question. :)

In my script I have a line with

os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

but this line didn't work.
But when I set this environment variable in Linux shell it works. Here
is a small example.

python shrink_bs_07022 6.py

Traceback (most recent call last):
File "shrink_bs_0702 26.py", line 25, in ?
from qt import *
File "/path/Linux/python/rh_linux/lib/python2.2/site-packages/
qt.py", line 46, in ?
import libsip
ImportError: libadamsqt.so: cannot open shared object file: No such
file or directory

setenv LD_LIBRARY_PATH /path/Linux/rh_linux

python shrink_bs_07022 6.py

Starting Script "Shrinker" ....

Why it's not working in script with command

os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

but in shell it works?

I hope it's understandable. :)
Thanks,
boris

**Thinker** · Feb 26 '07, 04:55 PM

Re: Interactive os.environ vs. os.environ in script

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Hash: SHA1

boris.smirnov@g mail.com wrote:

>
OK then I have to reformulate my question. :)
>
In my script I have a line with
>
os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'
>
but this line didn't work. But when I set this environment variable
in Linux shell it works. Here is a small example.
>

>python shrink_bs_07022 6.py

Traceback (most recent call last): File "shrink_bs_0702 26.py", line
25, in ? from qt import * File
"/path/Linux/python/rh_linux/lib/python2.2/site-packages/ qt.py",
line 46, in ? import libsip ImportError: libadamsqt.so: cannot open
shared object file: No such file or directory

ld-elf.so reads environment variables when it was loaded.
It never reads environment variables again!
That you setting environment in the process does not make link-editor
to re-read environment variable and take effect.

To resolve the problem, you can try to add the path to sys.path.

- --
Thinker Li - thinker@branda. to thinker.li@gmai l.com

http://heaven.branda.to/~thinker/GinGin_CGI.py

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**boris.smirnov@gmail.com** · Feb 27 '07, 07:55 AM

Re: Interactive os.environ vs. os.environ in script

On Feb 26, 5:44 pm, Thinker <thin...@branda .towrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>
>
>
>
>
boris.smir...@g mail.com wrote:
>

OK then I have to reformulate my question. :)

>

In my script I have a line with

>

os.environ["LD_LIBRARY_PAT H"]='/path/Linux/rh_linux'

>

but this line didn't work. But when I set this environment variable
in Linux shell it works. Here is a small example.

>

python shrink_bs_07022 6.py

Traceback (most recent call last): File "shrink_bs_0702 26.py", line
25, in ? from qt import * File
"/path/Linux/python/rh_linux/lib/python2.2/site-packages/ qt.py",
line 46, in ? import libsip ImportError: libadamsqt.so: cannot open
shared object file: No such file or directory

>
ld-elf.so reads environment variables when it was loaded.
It never reads environment variables again!
That you setting environment in the process does not make link-editor
to re-read environment variable and take effect.
>
To resolve the problem, you can try to add the path to sys.path.
>
- --
Thinker Li - thin...@branda. to thinker...@gmai l.comhttp://heaven.branda.t o/~thinker/GinGin_CGI.py
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Version: GnuPG v1.4.6 (FreeBSD)
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>
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KsEEcrvpw1CktEk VCKe/ojk=
=EQG6
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>
- Show quoted text -

Hi,
thanks for the tip, but it didn't help.

I used:
sys.path.append ('/path/Linux/rh_linux')

and the problem still persists:

Traceback (most recent call last):
File "shrink_bs_0702 26.py", line 26, in ?
from qt import *
File "/path/Linux/python/rh_linux/lib/python2.2/site-packages/
qt.py", line 46, in ?
import libsip
ImportError: libadamsqt.so: cannot open shared object file: No such
file or directory

Is there another possibility of how to solve it just by adding some
lines in script?

Thanks
Boris

**Peter Otten** · Feb 27 '07, 08:45 AM

Re: Interactive os.environ vs. os.environ in script

boris.smirnov@g mail.com wrote:

Is there another possibility of how to solve it just by adding some
lines in script?

I think you have to wrap your script in a shell script

#!/bin/sh
export LD_LIBRARY_PATH =/path/Linux/rh_linux
python shrink_bs_07022 6.py

To avoid that you can have the python script invoke itself, e. g.:

#!/usr/bin/env python
import os
if os.environ.get( "YADDA") != "whatever":
print "fix environment"
os.environ["YADDA"] = "whatever"
os.system("yadd a.py")
raise SystemExit

print "YADDA is now %r" % os.environ["YADDA"]
print "do your real stuff"

Peter

**boris.smirnov@gmail.com** · Feb 27 '07, 09:05 AM

Re: Interactive os.environ vs. os.environ in script

On Feb 27, 9:31 am, Peter Otten <__pete...@web. dewrote:

boris.smir...@g mail.com wrote:

Is there another possibility of how to solve it just by adding some
lines in script?

>
I think you have to wrap your script in a shell script
>
#!/bin/sh
export LD_LIBRARY_PATH =/path/Linux/rh_linux
python shrink_bs_07022 6.py
>
To avoid that you can have the python script invoke itself, e. g.:
>
#!/usr/bin/env python
import os
if os.environ.get( "YADDA") != "whatever":
print "fix environment"
os.environ["YADDA"] = "whatever"
os.system("yadd a.py")
raise SystemExit
>
print "YADDA is now %r" % os.environ["YADDA"]
print "do your real stuff"
>
Peter

Thanks for the reply.

If I that good understood I did this:
*************** *************** ****
import sys, re, glob, shutil
import os

if os.environ["LD_LIBRARY_PAT H"].count('/path/Linux/rh_linux') !=1:
os.environ["LD_LIBRARY_PAT H"]=os.environ["LD_LIBRARY_PAT H"]+':'+'/
path/Linux/rh_linux'
os.system("shri nk_bs_070226.py ")
raise SystemExit

from qt import *
*************** ********

Is that correct. If yes then it not works. If not then, what's wrong?

python shrink_bs_07022 6.py

Traceback (most recent call last):
File "./shrink_bs_07022 6.py", line 29, in ?
from qt import *
ImportError: No module named qt

Thanks
Boris

**Peter Otten** · Feb 27 '07, 09:45 AM

Re: Interactive os.environ vs. os.environ in script

boris.smirnov@g mail.com wrote:

On Feb 27, 9:31 am, Peter Otten <__pete...@web. dewrote:

>boris.smir...@ gmail.com wrote:

Is there another possibility of how to solve it just by adding some
lines in script?

>>
>I think you have to wrap your script in a shell script
>>
>#!/bin/sh
>export LD_LIBRARY_PATH =/path/Linux/rh_linux
>python shrink_bs_07022 6.py
>>
>To avoid that you can have the python script invoke itself, e. g.:
>>
>#!/usr/bin/env python
>import os
>if os.environ.get( "YADDA") != "whatever":
> print "fix environment"
> os.environ["YADDA"] = "whatever"
> os.system("yadd a.py")
> raise SystemExit
>>
>print "YADDA is now %r" % os.environ["YADDA"]
>print "do your real stuff"
>>
>Peter

>
Thanks for the reply.
>
If I that good understood I did this:
*************** *************** ****
import sys, re, glob, shutil
import os
>
>
if os.environ["LD_LIBRARY_PAT H"].count('/path/Linux/rh_linux') !=1:
os.environ["LD_LIBRARY_PAT H"]=os.environ["LD_LIBRARY_PAT H"]+':'+'/
path/Linux/rh_linux'
os.system("shri nk_bs_070226.py ")
raise SystemExit
>
from qt import *
*************** ********
>
Is that correct. If yes then it not works. If not then, what's wrong?

I don't know. You are not quoting the actual code you are using (from qt
import * is definitely not in line 29, and the #!/path/to/your/python is
missing). Do you have more than one python version installed? then you may
have to put

#!/usr/bin/python2.2

or similar in the first line of your script.

Peter

**boris.smirnov@gmail.com** · Feb 27 '07, 09:55 AM

Re: Interactive os.environ vs. os.environ in script

On Feb 27, 10:33 am, Peter Otten <__pete...@web. dewrote:

boris.smir...@g mail.com wrote:

On Feb 27, 9:31 am, Peter Otten <__pete...@web. dewrote:

boris.smir...@g mail.com wrote:
Is there another possibility of how to solve it just by adding some
lines in script?

>

I think you have to wrap your script in a shell script

>

#!/bin/sh
export LD_LIBRARY_PATH =/path/Linux/rh_linux
python shrink_bs_07022 6.py

>

To avoid that you can have the python script invoke itself, e. g.:

>

#!/usr/bin/env python
import os
if os.environ.get( "YADDA") != "whatever":
print "fix environment"
os.environ["YADDA"] = "whatever"
os.system("yadd a.py")
raise SystemExit

>

print "YADDA is now %r" % os.environ["YADDA"]
print "do your real stuff"

>

Peter

>

Thanks for the reply.

>

If I that good understood I did this:
*************** *************** ****
import sys, re, glob, shutil
import os

>

if os.environ["LD_LIBRARY_PAT H"].count('/path/Linux/rh_linux') !=1:
os.environ["LD_LIBRARY_PAT H"]=os.environ["LD_LIBRARY_PAT H"]+':'+'/
path/Linux/rh_linux'
os.system("shri nk_bs_070226.py ")
raise SystemExit

>

from qt import *
*************** ********

>

Is that correct. If yes then it not works. If not then, what's wrong?

>
I don't know. You are not quoting the actual code you are using (from qt
import * is definitely not in line 29, and the #!/path/to/your/python is
missing). Do you have more than one python version installed? then you may
have to put
>
#!/usr/bin/python2.2
>
or similar in the first line of your script.
>
Peter- Hide quoted text -
>
- Show quoted text -

Probably I understood it not correctly. What did you mean was to put
that code into my python script "shrink_bs_0702 26.py" and then calls
script itself?

So I took my script "shrink_bs_0702 26.py" and it starts with:
*************** *************** ****
#!/usr/bin/env python
import sys, re, glob, shutil
import os

then I put your code in that script

if os.environ["LD_LIBRARY_PAT H"].count('/path/Linux/rh_linux') !=1:
os.environ["LD_LIBRARY_PAT H"]=os.environ["LD_LIBRARY_PAT H"]+':'+'/
path/Linux/rh_linux'
os.system("shri nk_bs_070226.py ")
raise SystemExit

and here continues my script:

from qt import *

......
*************** ********

Is it correct?

BTW: On lines 3:18 I have comments, script description and
modifications, therefore is "from qt import *" on the line 29

**Peter Otten** · Feb 27 '07, 10:15 AM

Re: Interactive os.environ vs. os.environ in script

boris.smirnov@g mail.com wrote:

Probably I understood it not correctly. What did you mean was to put
that code into my python script "shrink_bs_0702 26.py" and then calls
script itself?

Yes.

So I took my script "shrink_bs_0702 26.py" and it starts with:
*************** *************** ****
#!/usr/bin/env python
import sys, re, glob, shutil
import os
>
then I put your code in that script
>
if os.environ["LD_LIBRARY_PAT H"].count('/path/Linux/rh_linux') !=1:
os.environ["LD_LIBRARY_PAT H"]=os.environ["LD_LIBRARY_PAT H"]+':'+'/
path/Linux/rh_linux'
os.system("shri nk_bs_070226.py ")
raise SystemExit
>
and here continues my script:
>
from qt import *
>
.....
*************** ********
>
Is it correct?

Yes.

BTW: On lines 3:18 I have comments, script description and
modifications, therefore is "from qt import *" on the line 29

The problem must be something else, then.

Peter