On 04/22/2010 12:18 PM, VictorMiller wrote:
I tried using sage -python
It still bombs out, but slightly differently: it now does a
raise child_exception in the _execute_child method of subprocess, and
gets the error string
OSError: [Errno 2] No such file or directory
On Apr 22, 12:58 pm, Jason Grout<[email protected]> wrote:
On 04/22/2010 11:38 AM, VictorMiller wrote:
I have some old Python programs that I've been using, and would like
to use them as part of SAGE. One particular function I have uses the
standard python module subprocess to call an external program, and
then process the output from that. This has worked fine in python for
a number of years (through various python version changes). However,
when I try to use it from within SAGE, when subprocess is finished
with the process and it tries to close the process handle it gets an
error
OSError: [Errno 2] No such file or directory.
[Actually I'm not sure if it's even able to spawn the process at all]
My guess is that your process can't find your executable. Try doing
this (which will check that subprocess works and also check that your
executable is found:
import subprocess
p=subprocess.Popen("/bin/sh",stdin=subprocess.PIPE,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
output=p.communicate('which ls\n')
print output[0], output[1]
Replace the "which ls" command with "which <YOUR PROGRAM>" to just
double-check that the spawned shell can see your program.
The above works for me in Sage, so I think subprocess works just fine in
Sage.
Thanks,
Jason
--
Jason Grout
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