@property
def sudo_str(self):
    sudo = ('sudo ' if self._sudo else '')
    askpass = ('-A ' if (self._sudo and self._sudo_askpass) else '')
    return '{}{}'.format(sudo, askpass)
@property
def sudo_str(self):
    sudo = ('sudo ' if self._sudo else )
    askpass = ('-A ' if (self._sudo and self._sudo_askpass) else )
    return '{}{}'.format(sudo, askpass)