Python, Ply1æ¥çµã£ã¦æ¨æ¥ã®ã¨ã³ããªãèªã¿è¿ãã¦ã¿ãã¨ãSymbolã£ã¦strãç¶æ¿ããã°è¯ãããNumberãintãç¶æ¿ããã°è¯ãããAddProcedureã¨ããã«ãã¤ã³ããã·ã¼ã¸ã£ãProcedureã®ä¸å½¢æ ã«éããªãããSchemeã®ã½ã¼ã¹ã³ã¼ãã1ã¤ã®æååã¨ãã¦æ¸¡ããããããªãã¦ããã³ããããªã£ã¦ããã®ã§ãã¡ãã£ã¨ä¿®æ£ããã Symbolã¨NumberSymbolã¯æååã®æ¯è¼ãNumberã¯ååæ¼ç®ãåºæ¥ãã°è¯ãã®ã ãããPythonã®strã¨intãå ã æã£ã¦ãæ©è½ããã®ã¾ã¾ä½¿ããããã«ãããããããç¶æ¿ãããã class Symbol(str): def eval(self, env): value = env.get(self) while isinstance(value, Symbol): value = value.eval(env) return
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