sys.stdin.readlines() in 2.2a ?

[CCLittle]

Hi all, I'm trying to learn and master python.  I encountered an example in
"Programming Python 2nd Edition" by Mark Lutz that used
sys.stdin.readlines(), which does not exist in python 2.2a.  It does exist
however, on a solaris system running 1.5.2.  My questions are:

1. Where did it go?
2. What kind of problems am I going to get by doing examples written for
1.5.2 but on 2.2a?
3. Where can I get information on this sort of changes?

Thanks in advance.
Kevin