calling python scripts as a sub-process

[Dan Upton]

On Wed, Nov 19, 2008 at 2:13 PM, Philip Semanchuk <philip at semanchuk.com> 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)