i have the following script that i am using to get the log messages from svn

import pysvn
class  svncheck(): 
    def __init__(self, svn_root="http://10.11.25.3/svn/Moodle/modules", svn_user=None, svn_password=None):
        self.user = svn_user
        self.password = svn_password
        self.root = svn_root

    def diffrence(self): 
        client = pysvn.Client()
        client.commit_info_style = 1
        client.callback_notify = self.notify
        client.callback_get_login = self.credentials
        log  = client.log(
        self.root, 
        revision_start=pysvn.Revision( pysvn.opt_revision_kind.number, 0),
        revision_end=pysvn.Revision( pysvn.opt_revision_kind.number, 5829),
        discover_changed_paths=True,
        strict_node_history=True,
        limit=0,
        include_merged_revisions=False,
        )
        print log
    def notify( event_dict ):
        print event_dict
        return   

    def credentials(realm, username, may_save):
           return True, self.user, self.password, True



s = svncheck()
s.diffrence()

when i run this script its returning a empty dictionary object [<PysvnLog ''>, <PysvnLog ''>, <PysvnLog ''>,..

any idea what i am doing wrong here ? i am using pysvn version 1.7.2 built again svn version 1.6.5 cheers Nash