[IronPython] import subprocess
Matthew S Bourdua
bourduam at msu.edu
Thu Jul 5 21:49:57 CEST 2007
Hello,
I have a question about the "subprocess" module. I am unable to "import
subprocess" in my scripts. Will IronPython will support this in the future,
or, perhaps is it intentionally not supported? (Or perhaps I am doing
something stupid, and it should work?)
I recently began using IronPython because I had both Python scripts and .Net
classes that I needed to use together. So far I have been pretty pleased
with how well everything is working.
My biggest problem has been that the os.system() call does not work in
IronPython. I notice that this was raised as an issue in Sep '06
(http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=2982).
While hunting around for an alternative, I found the following text in the
library reference (http://docs.python.org/lib/module-subprocess.html):
"The subprocess module ... intends to replace several other, older modules
and functions, such as:
os.system
os.spawn*
os.popen*
popen2.*
commands.*"
For this reason, I thought that perhaps "os.system" was going to become
deprecated in favor of "subprocess", and that might explain why this issue
has not been addressed.
However, I am unable to "import subprocess" in IronPython. When I do so, an
exception is raised because, "No module named fcntl". Digging into this a
bit, I notice the following variable defined within subprocess.py (this is
from ActivePython 2.5):
mswindows = (sys.platform == "win32")
And then many conditional statements of the form:
if mswindows:
...#Windows specific code
else
...#Non-windows code, presumably
IronPython fails this check because sys.platform = 'cli', and thus is lead
into using modules that are (I would guess) meant for Unix-based systems.
Further, this behavior seems to be known - I noticed that this seemed to be
accounted for in (what appears to be) the automatic test-suite code located
here:
http://www.codeplex.com/IronPython/SourceControl/FileView.aspx?itemId=296023
&changeSetId=21805
What's strange to me is that I couldn't find a single reference to using
subprocess in IronPython anywhere. So perhaps this issue is widely
understood by everybody but me (I'm relatively new to Python), or simply not
an issue for anybody but me?
Anyway, I was hoping somebody on this mailing list might have some insight
to share.
Thanks,
Matt
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