title: Run PowerShell function from Python script
body: <p>I have a need to run a PowerShell function from a Python script.  Both the .ps1 and the .py files currently live in the same directory.  The functions I want to call are in the PowerShell script.  Most answers I've seen are for running entire PowerShell scripts from Python.  In this case, I'm trying to run an individual function within a PowerShell script from a Python script.</p>
  
  <p>Here is the sample PowerShell script:</p>
  
  <pre><code># sample PowerShell
  Function hello
  {
      Write-Host "Hi from the hello function : )"
  }
  
  Function bye
  {
      Write-Host "Goodbye"
  }
  
  Write-Host "PowerShell sample says hello."
  </code></pre>
  
  <p>and the Python script:</p>
  
  <pre><code>import argparse
  import subprocess as sp
  
  parser = argparse.ArgumentParser(description='Sample call to PowerShell function from Python')
  parser.add_argument('--functionToCall', metavar='-f', default='hello', help='Specify function to run')
  
  args = parser.parse_args()
  
  psResult = sp.Popen([r'C:\WINDOWS\system32\WindowsPowerShell\v1.0\powershell.exe',
  '-ExecutionPolicy',
  'Unrestricted',
  '. ./samplePowerShell',
  args.functionToCall],
  stdout = sp.PIPE,
  stderr = sp.PIPE)
  
  output, error = psResult.communicate()
  rc = psResult.returncode
  
  print "Return code given to Python script is: " + str(rc)
  print "\n\nstdout:\n\n" + str(output)
  print "\n\nstderr: " + str(error)
  </code></pre>
  
  <p>So, somehow, I want to run the 'hello()' or the 'bye()' function that is in the PowerShell sample.  It would also be nice to know how to pass in parameters to the function.
  Thanks!</p>