How to put a scrollbar to a frame?

[JAY]

Hi there,

I am pretty new to python. My python script makes a frame in a widget to
display some messages (UNIX system),
it works fine. However, if the message gets too long, the frame will be
extended and make the whole widget bigger
than screen.

To solve the problem, I want to put a scrollbar to the frame for the
messages so that it's size won't change. But I don't
know how. Could anybody tell me how to do it?

Thank you in advance,

JAY