How to use 'powershell run command in background' in Python

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def run_powershell_script(script_content):
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  tmp_dir = tempfile.gettempdir()
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  random_filename = ''.join(random.choice(string.lowercase) for i in range(10))
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  script_file = open(os.path.join(tmp_dir,random_filename+".ps1"),"w")
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  script_file.write(script_content)
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  script_file.close()
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  result = os_run_os_command("powershell  -ExecutionPolicy unrestricted -File {0}".format(script_file.name))
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  os.remove(script_file.name)
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  return result

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def powershell_execute(script, func):
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    """
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    Execute a powershell script
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    """
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    output = ""
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    try:
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        script = re.sub("Write-Verbose ", "Write-Output ", script, flags=re.I)
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        script = re.sub("Write-Error ", "Write-Output ", script, flags=re.I)
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        script = re.sub("Write-Warning ", "Write-Output ", script, flags=re.I)
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        full_args = ["powershell.exe", "-NoProfile", "-NoLogo", "-C", "-"]
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        info = subprocess.STARTUPINFO()
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        info.dwFlags = STARTF_USESHOWWINDOW
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        info.wShowWindow = SW_HIDE
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        p = subprocess.Popen(full_args, startupinfo=info, stdin=subprocess.PIPE, stderr=subprocess.STDOUT,
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                             stdout=subprocess.PIPE, universal_newlines=True, shell=True)
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        p.stdin.write("$base64=\"\"" + "\n")
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        n = 25000
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        b64_script = base64.b64encode(script)
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        tab = [b64_script[i:i + n] for i in range(0, len(b64_script), n)]
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        for t in tab:
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            p.stdin.write("$base64+=\"%s\"\n" % t)
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            p.stdin.flush()
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        p.stdin.write("$d=[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64))\n")
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        p.stdin.write("Invoke-Expression $d\n")
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        p.stdin.write("\n$a=Invoke-Expression \"%s\" | Out-String\n" % func)
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        p.stdin.write("$b=[System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes(\"$a\"))\n")
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        p.stdin.write("Write-Host \"[BEGIN]\"\n")
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        p.stdin.write("Write-Host $b\n")
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        # begin flag used to remove possible bullshit output print before the func is launched
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        if '[BEGIN]' in p.stdout.readline():
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            # Get the result in base64
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            for i in p.stdout.readline():
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                output += i
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            output = base64.b64decode(output)
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    except Exception:
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        pass
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    return output