Python执行powershell命令

Question

我尝试执行PowerShell命令以获取内存使用情况并获得结果。

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

执行命令是成功的，但只获得以下结果：

subproces CalledProcessError.output = 
0

如何获取PowerShell结果？

Answer 1

你需要这样做：

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

请注意True而不是TRUE将"powershell.exe"提供给check_output和r之前用\字符串。

但我强烈建议使用psutil而不是尝试获取和解析PowerShell结果：

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)

Answer 2

与上面相同，但对于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())