Dan Upton wrote:
On Wed, Nov 19, 2008 at 2:38 PM, Catherine Moroney
<[EMAIL PROTECTED]> wrote:
Dan Upton wrote:
On Wed, Nov 19, 2008 at 2:13 PM, Philip Semanchuk <[EMAIL PROTECTED]>
wrote:
On Nov 19, 2008, at 2:03 PM, Catherine Moroney wrote:
The command (stored as an array of strings) that I'm executing is:
['python ../src_python/Match1.py ',
'--file_ref=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_BF_F03_0024.hdf ',
'--file_cmp=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_DF_F03_0024.hdf ',
'--block_start=62 ', '--block_end=62 ', '--istep=16 ', "--chmetric='M2'
",
"--use_textid='true '"]
[snip]
I get the error below. Does anybody know what this error refers
to and what I'm doing wrong? Is it even allowable to call another
script as a sub-process rather than calling it directly?
File "../src_python/Match4.py", line 24, in RunMatch4
sub1 = subprocess.Popen(command1)
File "/usr/lib64/python2.5/subprocess.py", line 593, in __init__
errread, errwrite)
File "/usr/lib64/python2.5/subprocess.py", line 1051, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
Try supplying a fully-qualified path to your script, e.g.:
['python /home/catherine/src_python/Match1.py ',
'--file_ref=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_BF_F03_0024.hdf ',
'--file_cmp=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_DF_F03_0024.hdf ',
'--block_start=62 ', '--block_end=62 ', '--istep=16 ', "--chmetric='M2'
",
"--use_textid='true '"]
I think when I came across this error, I added shell=True, e.g.
sub1 = subprocess.Popen(command, shell=True)
I added the shell=True and this time it got into Match1 (hurrah!),
but it then opened up an interactive python session, and didn't
complete until I manually typed 'exit' in the interactive session.
Match1 looks like:
if __name__ == "__main__":
<<< parse arguments >>>
RunMatch1(file_ref, file_cmp, iblock_start, iblock_end, \
nlinep, nsmpp, mindispx, maxdispx, mindispl, \
maxdispl, istep, chmetric, use_textid)
exit()
where the routine RunMatch1 does all the actual processing.
How do I get Match1 to run and exit normally without opening up an
interactive session, when called as a subprocess from Match4?
Alternately, rather than using a list of arguments, have you tried
just using a string? (Again, that's the way I do it and I haven't
been having any problems recently, although I'm running shell scripts
or binaries with arguments rather than trying to invoke python on a
script.)
command = "python ../src_python/Match1.py
--file_ref=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_BF_F03_0024.hdf
--file_cmp=MISR_AM1_GRP_ELLIPSOID_GM_P228_O003571_DF_F03_0024.hdf
--block_start=62 --block_end=62 --istep=16 --chmetric='M2'
--use_textid=true"
proc = subprocess.Popen(command, shell=True)
Thanks - that did the trick. I just passed in one long string
and everything actually works. Wow! I had no idea if this was
even do-able.
This is so cool, and saves me a lot of code duplication. I can
spawn off half a dozen jobs at once and then just wait for them
to finish. It's great that python can function both as a
scripting language and also a full-blown programming language
at the same time.
Catherine
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