code: def get_last_changed_revision(client, url):
      
      try:
          svn_entries = client.info2(url,
                                     pysvn.Revision(pysvn.opt_revision_kind.head),
                                     recurse=False)
          if not svn_entries:
              raise ReleaseVCSError("svn.info2() returned no results on url %s" % url)
          return svn_entries[0][1].last_changed_rev
      except pysvn.ClientError, ce:
          raise ReleaseVCSError("svn.info2() raised ClientError: %s" % ce)
docs: util func, get last revision of url