#NEWLINE# def _remove_predecessor( self , node , predecessor , trans_id ) : #NEWLINE# #INDENT# 'remove a predecessor from a node\n        node: the node name (string)\n        predecessor: the predecessor name (string)\n        trans_id: a transaction ID (int)\n        ' #NEWLINE# self . _remove_relative ( 'predecessors' , trans_id , predecessor , trans_id )