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                標記被lex返回后,它們的值被保存在`value`屬性中。正常情況下,value是匹配的實際文本。事實上,value可以被賦為任何Python支持的類型。例如,當掃描到標識符的時候,你可能不僅需要返回標識符的名字,還需要返回其在符號表中的位置,可以像下面這樣寫: ~~~ def t_ID(t): ... # Look up symbol table information and return a tuple t.value = (t.value, symbol_lookup(t.value)) ... return t ~~~ 需要注意的是,不推薦用其他屬性來保存值,因為yacc.py模塊只會暴露出標記的value屬性,訪問其他屬性會變得不自然。如果想保存多種屬性,可以將元組、字典、或者對象實例賦給value。
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