string compare question.Please Help!!!

[张少驰]

I have question about cmp function,follows:
$python
Python 2.2b1 (#1, Nov 21 2001, 10:24:36)
[GCC 2.96 20000731 (Red Hat Linux 7.0)] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>>cmp('10.66.73.78','10.0.0.0')
1 
#the result 1 is my desire


>>>cmp('10.66.73.78','10.255.255.255')
1  
#the result isn't my desire,I want to 
#make '10.66.73.78' is less than '10.255.255.255',
#I want to get 0,but it return 1

Where is my wrong? How to correct it? Thanks.
Edward
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