NEWBIE: how to get text onto 2 lines on a 16x2 lcd display

[RobH]

I have some sample/demo python code for scrolling and outputting text 
onto a 16x2 lcd display.

I would like to put my own message or text outputting to the lcd on 2 
lines. I have tried using lcd.message('my message',1) and 
lcd.message('my message', 2), but the output says:

TypeError: message() takes exactly 2 arguments (3 given)

I have also seen this on the, stackexchange site:
lcd_string("your text " + str(yourVar), 1)

But what is str(yourVar), as I assume it means a variable.
If I could have a working example please, that would be great.

Thanks