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如下定义
{ action: fetcher url: http://www.verycd.com/base/cartoon/page${0,1}${0,9} subaction: [] }
pyrailgun在运行的时候会对标记${}进行计算并采用笛卡尔积的方式
${0,1}${0,9}展开为 00 01 02 03 04 .... 99
如果需要抓取 0 1 2 ... 99
则可以定义为${0,99} 展开后即为想要的0-99