Re: Passing environment variable to subprocess causes failure

[MRAB]

davidgo...@davidgould.com wrote:
 I'm attempting to run subprocess and passing in an environment
 variable. When I do this the child process fails with an error. When I
 don't pass an environement variable it runs fine.

 BTW Running this code under Windows XP with Python 2.6.1

 Code A:

 p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
 Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
 Source' } )
 print p.communicate()[0]
 print p.returncode

 Output:

 None
 -1072365564

 Code B:

 p = subprocess.Popen( ['python', '-V'] )
 print p.communicate()[0]
 print p.returncode

 Output:

 Python 2.6.1
 0

 Any idea why passing an environment variable causes it to fail?
 Thanks.

Are you sure it's not the path within the dict you're passing that's wrong?
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Re: Passing environment variable to subprocess causes failure

[rdmurray]

Quoth MRAB goo...@mrabarnett.plus.com:
 davidgo...@davidgould.com wrote:
   I'm attempting to run subprocess and passing in an environment
   variable. When I do this the child process fails with an error. When I
   don't pass an environement variable it runs fine.
  
   BTW Running this code under Windows XP with Python 2.6.1
  
   Code A:
  
   p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
   Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
   Source' } )
   print p.communicate()[0]
   print p.returncode
  
   Output:
  
   None
   -1072365564
  
   Code B:
  
   p = subprocess.Popen( ['python', '-V'] )
   print p.communicate()[0]
   print p.returncode
  
   Output:
  
   Python 2.6.1
   0
  
   Any idea why passing an environment variable causes it to fail?
   Thanks.
  
 Are you sure it's not the path within the dict you're passing that's wrong?

Or there's something missing from the environment that python needs,
causing a non-zero return code when it is missing.  (That seems odd,
though.)

You ought to print communiicate()[1] to see if there is an
accompanying error message that would shed light on the problem.

--RDM

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Re: Passing environment variable to subprocess causes failure

[Miki]

 Code A:

 p = subprocess.Popen( ['python', '-V'], env={ 'PYTHONPATH': 'C:/
 Documents and Settings/David Gould/workspace/DgTools/Common/Trunk/
 Source' } )
 print p.communicate()[0]
 print p.returncode

 Output:

 None
 -1072365564
My *guess* is that since PATH is not in the environment you're
passing, the shell can't find the python interpreter.
Try:
from os import environ
from subprocess import Popen, PIPE
env = environ.copy()
# Warning: override existing PYTHONPATH
env[PYTHONPATH] = C:/Documents and Settings/David Gould/workspace/
DgTools/Common/Trunk/Source
p = = subprocess.Popen(['python', '-V'], env=env, stdout=PIPE)
print p.communicate()
print p.returncode

HTH,
--
Miki miki.teb...@gmail.com
http://pythonwise.blogspot.com
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