The standard for compiler design is to break it in two modules: the front end that reads and decodes the input file, and the back end that produces the code or, in this case, the table class.
编译器的设计标准是将其分成两个模块：前端和后端，前端读取输入文件并对该文件进行解码，后端生成代码，或者在这种情况下生成 table 类。
To produce code that runs faster and is easy to maintain, it makes far more sense to use a hash table that stores the command-line options, then USES the hash to validate the user-specified input.
为了生成运行更加快捷并易于维护的代码，使用散列表存储命令行选项并使用散列验证用户指定的输入，这种方法非常有帮助。
Produces a list of the unique code occurrences and their frequency in an output table for a specified set of fields from an input feature class or table.
对于一个输入元素类或表格中具体指定的一组字段，在一个输出表格中生成一个特定的代码事件及频率列表。
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