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haio/gist:4670140

Created January 30, 2013 02:41
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if __FILE__ == $0
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gistfile1.txt
if __FILE__ == $0
__FILE__ 是一个魔法值，它存有现在运行的脚本文件的名字。$0 是启动脚本的名字。 代码里的比较结构的意思是 “如果这是启动脚本的话...” 这允许代码作为库调用的时候不运行启动代码， 而在作为执行脚本的时候调用启动代码。
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