redirect stdout to a file and terminate if stderr is encountered using python subprocess
I am writing a pipeline in python 3.6 which internally executes several command-line based software. Each internal software is executed using subprocess.run() . I want to
- redirect the
stdoutof each software to a separate file, - if there is an error produced by an internal software I want to redirect the error to
stderr(so the user can see it), redirect to a separate file and terminate the execution of the pipeline.
The first step I do like this:
with open("outfile", "wb", 0) as outfile:
subprocess.run(cmd, stdout=outfile, check=True)
My question 1 is if there is a better way of achieving the same? There are many commands in the pipeline and I don't want open separate file for each of them.
Regarding the second question, so I am not sure how to solve it: one way would be to write the stderr to a file and then check if the file is empty, but I feel its a wrong way of doing it.
Any suggestions are appreciated,
python-3.x subprocess
asked Nov 13 '18 at 22:33
HrantHrant
657
add a comment |
I am writing a pipeline in python 3.6 which internally executes several command-line based software. Each internal software is executed using subprocess.run() . I want to
- redirect the
stdoutof each software to a separate file, - if there is an error produced by an internal software I want to redirect the error to
stderr(so the user can see it), redirect to a separate file and terminate the execution of the pipeline.
The first step I do like this:
with open("outfile", "wb", 0) as outfile:
subprocess.run(cmd, stdout=outfile, check=True)
My question 1 is if there is a better way of achieving the same? There are many commands in the pipeline and I don't want open separate file for each of them.
Regarding the second question, so I am not sure how to solve it: one way would be to write the stderr to a file and then check if the file is empty, but I feel its a wrong way of doing it.
Any suggestions are appreciated,
python-3.x subprocess
asked Nov 13 '18 at 22:33
HrantHrant
657
add a comment |
I am writing a pipeline in python 3.6 which internally executes several command-line based software. Each internal software is executed using subprocess.run() . I want to
- redirect the
stdoutof each software to a separate file, - if there is an error produced by an internal software I want to redirect the error to
stderr(so the user can see it), redirect to a separate file and terminate the execution of the pipeline.
The first step I do like this:
with open("outfile", "wb", 0) as outfile:
subprocess.run(cmd, stdout=outfile, check=True)
My question 1 is if there is a better way of achieving the same? There are many commands in the pipeline and I don't want open separate file for each of them.
Regarding the second question, so I am not sure how to solve it: one way would be to write the stderr to a file and then check if the file is empty, but I feel its a wrong way of doing it.
Any suggestions are appreciated,
python-3.x subprocess
asked Nov 13 '18 at 22:33
HrantHrant
657
I am writing a pipeline in python 3.6 which internally executes several command-line based software. Each internal software is executed using subprocess.run() . I want to
- redirect the
stdoutof each software to a separate file, - if there is an error produced by an internal software I want to redirect the error to
stderr(so the user can see it), redirect to a separate file and terminate the execution of the pipeline.
The first step I do like this:
with open("outfile", "wb", 0) as outfile:
subprocess.run(cmd, stdout=outfile, check=True)
My question 1 is if there is a better way of achieving the same? There are many commands in the pipeline and I don't want open separate file for each of them.
Regarding the second question, so I am not sure how to solve it: one way would be to write the stderr to a file and then check if the file is empty, but I feel its a wrong way of doing it.
Any suggestions are appreciated,
python-3.x subprocess
python-3.x subprocess
asked Nov 13 '18 at 22:33
HrantHrant
657
asked Nov 13 '18 at 22:33
HrantHrant
657
asked Nov 13 '18 at 22:33
HrantHrant
657
asked Nov 13 '18 at 22:33
HrantHrant
657
asked Nov 13 '18 at 22:33
HrantHrant
657
657
add a comment |
add a comment |
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