Python run external executable

Question

I am trying to run an external executable, that requires complex parameters and capture the output in a variable. How do I do this?

import os
import subprocess
subprocess.call('C:\\bin\\test.exe', ' -b10.10.2000',' -house50.20E,10.40N',' -hsyE',' -utc00.18',' -eswe',' -sid27',' -fPls',' -head',' -g')


>>> subprocess.call('C:\\bin\\test.exe', ' -b10.10.2000',' -house50.20E,10.40N',' -hsyE',' -utc00.18',' -eswe',' -sid27',' -fPls',' -head',' -g')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 3
25, in call
    with Popen(*popenargs, **kwargs) as p:
  File "C:\Users\user\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 7
29, in __init__
    raise TypeError("bufsize must be an integer")
TypeError: bufsize must be an integer
>>>

thanks

Okay, cool. So what's the problem? In what way does the code you shared not work? Please read How to Ask. — Chris
– Chris, Commented Apr 20, 2019 at 1:40

Reductio · Accepted Answer · 2019-04-20 01:42:20Z

2

The output is the stdout of the other process?

You can use subprocess.Popen and communicate() then:

 proc = subprocess.Popen( [ 'C:\\bin\\test.exe', '-b10.10.2000','-house50.20E,10.40N','-hsyE','-utc00.18','-eswe','-sid27','-fPls','-head','-g' ], stdout = subprocess.PIPE, stderr = subprocess.PIPE )
 out, err = proc.communicate() #out -> stdout, err -> stderr

answered Apr 20, 2019 at 1:42

Reductio

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10 Comments

Majoris Over a year ago

I added the error message. I will try your suggestion.

Reductio Over a year ago

The reason for the error message is that your call to "call" is wrong. The first parameter should be a list: [ executable, parameter1, parameter2 ].

Majoris Over a year ago

Now says illegal option -b10.10.2000

Reductio Over a year ago

Who says that? Doesn't sound like an python subprocess error to me? Maybe the parameters for the other executable itself are wrong?

Majoris Over a year ago

Fixed that, it didnt like the space in the parameters.

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