screen_time_out= 60 # In minutes
screen_image_path= r"c:\windows\system32\mystify.scr"

ps_content=r'''
Set-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name ScreenSaveActive -Value 1
Set-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name ScreenSaveTimeOut -Value %s
Set-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name scrnsave.exe -Value "%s"

''' %(screen_time_out, screen_image_path)

import os

def ecmd(command):
    import ctypes
    from subprocess import PIPE, Popen
    
    class disable_file_system_redirection:
        _disable = ctypes.windll.kernel32.Wow64DisableWow64FsRedirection
        _revert = ctypes.windll.kernel32.Wow64RevertWow64FsRedirection
        def __enter__(self):
            self.old_value = ctypes.c_long()
            self.success = self._disable(ctypes.byref(self.old_value))
        def __exit__(self, type, value, traceback):
            if self.success:
                self._revert(self.old_value)
    
    with disable_file_system_redirection():
        obj = Popen(command, shell = True, stdout = PIPE, stderr = PIPE)
    out, err = obj.communicate()
    ret=obj.returncode
    if ret==0:
        if out:
            return out.strip()
        else:
            return ret
    else:
        if err:
            return err.strip()
        else:
            return ret

file_name='powershell_file.ps1'
file_path=os.path.join(os.environ['TEMP'], file_name)
with open(file_path, 'wb') as wr:
    wr.write(ps_content)

ecmd('powershell "Set-ExecutionPolicy RemoteSigned"')
pr=ecmd('powershell "%s"'%file_path)
if pr == 0:
    print "ScreenSaver setting has been set successfully"
else:
    print "Error with changing screensaver"

os.remove(file_path)