#NEWLINE# def preserve( self , object , sexp ) : #NEWLINE# #INDENT# "\n        (internal) Mark an object's persistent list for later referral.\n        " #NEWLINE# if ( id ( sexp ) in self . cooked ) : #NEWLINE# #INDENT# self . preserved [ id ( object ) ] [ 2 ] = sexp #NEWLINE# sexp = self . preserved [ id ( object ) ] #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# self . preserved [ id ( object ) ] = sexp #NEWLINE# #UNINDENT# return sexp