#NEWLINE# def fetch_node_from( self , path ) : #NEWLINE# #INDENT# ' Returns a node for a path.\n\n        :param path: Tuple of :term:`hashable` s.\n        :rtype: :class:`~cerberus.errors.ErrorTreeNode` or :obj:`None`\n        ' #NEWLINE# context = self #NEWLINE# for key in path : #NEWLINE# #INDENT# context = context [ key ] #NEWLINE# if ( context is None ) : #NEWLINE# #INDENT# return None #NEWLINE# #UNINDENT# #UNINDENT# return key