What's the best way to replace value of attribute which can handle multiple values?

[Zhang Huangbin]

Hi, all.

What's the best way to 'replace' value of attribute which can handle  
multiple values?

Such as:

dn: uid=myuid,dc=example,dc=com
cn: cn1
cn: cn2
cn: cn3

My purpose is to get ldif like this (no cn=cn2 any more):

dn: uid=myuid,dc=example,dc=com
cn: cn1
cn: cn3
cn: cn4

I want to replace cn=cn2 by cn=cn4 if it exist, or add cn=cn4 directly  
if 'cn=cn2' donesn't exist.

If cn=cn2 is not exist, [(ldap.MOD_DELETE, 'cn', 'cn2')] will raise an  
error.
If cn=cn2 is not exist, [(ldap.MOD_ADD, 'cn', 'cn4')] will add cn=cn4,  
but can't delete 'cn=cn2'.

Thanks very much. :)

-- 
Best Regards.

Zhang Huangbin

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