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正负 plusminus包基于的 helper方法提供了一个现成的算术解析器和评估器。 可以使用解析和评估包含6函数算术表达式的 : from plusminus import BasicArithmeticParser parser = BasicArithmeticParser () print ( parser . evaluate ( "2+3/10" )) 解析器还可以返回ArithNode对象的抽象语法树: parsed_elements = parser . parse ( "2+3/10" ) 算术表达式根据用于运算符优先级的标准规则求值,从而允许使用括号覆盖: (
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