Python execute powershell command

Question

I am try to execute a PowerShell command to get the memory usage and get the result.

import subprocess
output = subprocess.call(["powershell.exe", "Get-Counter -Counter "+'"\memory\\available mbytes"'+" -MaxSamples 10 -SampleInterval 1"])
try:
    subprocess.check_output("Get-Counter -Counter "+'"\memory\\available mbytes"'+" -MaxSamples 10 -SampleInterval 1", shell=TRUE)
except subprocess.CalledProcessError, e:
    print "subproces CalledProcessError.output = " + e.output

print output

It is success to execute the command, but only get the following result:

subproces CalledProcessError.output = 
0

How can I get the PowerShell result back?

Does your command (Get-Counter -Counter "\memory\available mbytes" -MaxSamples 10 -SampleInterval 1) work in an interactive powershell session? — T S
– T S, Commented May 29, 2017 at 21:22

Steve Barnes · Accepted Answer · 2017-03-01 07:50:43Z

You need to do:

try:
   output = subprocess.check_output(
              ["powershell.exe", "Get-Counter", 
               "-Counter "+r'"\memory\available mbytes"',
               "-MaxSamples 10", "-SampleInterval 1"], 
              shell=True)
except subprocess.CalledProcessError, e:
    print "subproces CalledProcessError.output = " + e.output
print output

Notice True rather than TRUE supplying the "powershell.exe" to check_output and the r before strings with \ in.

But I would strongly recommend using psutil instead of trying to get and parse PowerShell results:

In [4]: import psutil

In [5]: psutil.virtual_memory()
Out[5]: svmem(total=17087684608L, available=8599142400L, percent=49.7, used=8488542208L, free=8599142400L)

In [6]: psutil.swap_memory()
Out[6]: sswap(total=38059204608L, used=14400655360L, free=23658549248L, percent=37.8, sin=0, sout=0)

J Rattur · Accepted Answer · 2017-09-25 07:44:56Z

0

Same example as above but for Python 3:

try:
   output = subprocess.check_output(
              ["powershell.exe", "Get-Counter", 
               "-Counter "+r'"\memory\available mbytes"',
               "-MaxSamples 10", "-SampleInterval 1"], 
              shell=True)
except subprocess.CalledProcessError as e:
    print ("subproces CalledProcessError.output =", e.output)
print (output.decode())

answered Sep 25, 2017 at 7:44

J Rattur

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