How to use cmp() function to compare 2 files?

[yinglcs at gmail.com]

Hi,

i have 2 files which are different (1 line difference):
$ diff groupresult20070226190027.xml groupresult20070226190027-2.xml
5c5
< x:22 y:516 w:740 h:120 area:
---
> x:22 y:516 w:740 h:1202 area:


But when I use the cmp() function to compare 2 files, it return "1",

$ python Python 2.4.3 (#1, Oct 23 2006, 14:19:47)
[GCC 4.1.1 20060525 (Red Hat 4.1.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> cmp("groupresult20070226190027.xml", "groupresult20070226190027-2.xml")
1

Can you please tell me why? And how can I compare the content of 2
files in python?