According to this transformation grammar, a program transformation algorithm can transform source language programs into object language programs.
程序转换算法根据转换文法，可把源语言程序转换为目标语言程序。
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In the Python language, everything is an object a program can access, including simple types that hold integers, as well as the actual code you write and its representation in the Python interpreter.
We filter out duplicate content, structure data into a unified object model, and then use our natural language processing program, SiLCC, to extract keywords and apply them as tags.