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                函數`lex.lex()`使用Python的反射機制讀取調用上下文中的正則表達式,來創建lexer。lexer一旦創建好,有兩個方法可以用來控制lexer對象: * `lexer.input(data)`?重置lexer和輸入字串 * `lexer.token()`?返回下一個LexToken類型的標記實例,如果進行到輸入字串的尾部時將返回`None` 推薦直接在lex()函數返回的lexer對象上調用上述接口,盡管也可以向下面這樣用模塊級別的lex.input()和lex.token(): ~~~ lex.lex() lex.input(sometext) while 1: tok = lex.token() if not tok: break print tok ~~~ 在這個例子中,lex.input()和lex.token()是模塊級別的方法,在lex模塊中,input()和token()方法綁定到最新創建的lexer對象的對應方法上。最好不要這樣用,因為這種接口可能不知道在什么時候就失效(譯者注:垃圾回收?)
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