[CentOS] Any documents for python-kerberos package??

Hi all,

 I'm in a project to program Kerberos with Python. The headache encountered is, there is no documents on how to call the Kerberos module functions and results. 

when run 'help kerberos.checkPassword' in python, it just show things like:

Help on built-in function checkPassword in module kerberos:

checkPassword(...)
    Check the supplied user/password against Kerberos KDC.
(END) 
  
So the help doesn't give an idea on how to call the function, and what the the results and exceptions. 

Any one has successfully programmed python-kerberos, please shed a light on this. 

Thanks a lot.

--David