How to make a call to an executable from Python script?
Solution 1
For executing the external program, do this:
import subprocess
args = ("bin/bar", "-c", "somefile.xml", "-d", "text.txt", "-r", "aString", "-f", "anotherString")
#Or just:
#args = "bin/bar -c somefile.xml -d text.txt -r aString -f anotherString".split()
popen = subprocess.Popen(args, stdout=subprocess.PIPE)
popen.wait()
output = popen.stdout.read()
print output
And yes, assuming your bin/bar
program wrote some other assorted files to disk, you can open them as normal with open("path/to/output/file.txt")
. Note that you don't need to rely on a subshell to redirect the output to a file on disk named "output" if you don't want to. I'm showing here how to directly read the output into your python program without going to disk in between.
Solution 2
The simplest way is:
import os
cmd = 'bin/bar --option --otheroption'
os.system(cmd) # returns the exit status
You access the files in the usual way, by using open()
.
If you need to do more complicated subprocess management then the subprocess module is the way to go.
Solution 3
For executing a unix executable file. I did the following in my Mac OSX and it worked for me:
import os
cmd = './darknet classifier predict data/baby.jpg'
so = os.popen(cmd).read()
print so
Here print so
outputs the result.
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fx.
Updated on June 05, 2020Comments
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fx. almost 4 years
I need to execute this script from my Python script.
Is it possible? The script generate some outputs with some files being written. How do I access these files? I have tried with subprocess call function but without success.
fx@fx-ubuntu:~/Documents/projects/foo$ bin/bar -c somefile.xml -d text.txt -r aString -f anotherString >output
The application "bar" also references to some libraries, it also create the file "bar.xml" besides the output. How do I get access to these files? Just by using open()?
Thank you,
Edit:
The error from Python runtime is only this line.
$ python foo.py bin/bar: bin/bar: cannot execute binary file
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Kaleb Pederson about 14 yearssubprocess is what you need to use, can you provide an example so we have a better idea why it didn't work?
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user1066101 about 14 years"subprocess call"? What is that? Please post the code you used and the error you actually got.
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Peter Lyons about 14 yearsYes, he's talking about the "call" function in the standard "subprocess" module, which is the better way to do this, although os.system may be adequate depending on his needs
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fx. about 14 yearsHi Kaleb, I edited the question.
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fx. about 14 yearsHi Peter, there is the error: bin/bar: bin/bar: cannot execute binary file and without any other information from the Python runtime. What is the cause?
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fx. about 14 yearsit's about the executable's error. I have solved it, thanks Peter.
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Brian McCutchon about 5 yearsNote that this has the same security caveat as
subprocess.Popen(shell=True)
. Don't use it with anything other than a literal string. -
Timo over 3 yearsI want to execute
tesseract
on every file in my folder, so I os.walk and then do the progr in the loop. How does it work?