how to implement a queue-like container with sort function

[iMath]

在 2013年11月29日星期五UTC+8下午10时57分36秒，Mark Lawrence写道：
> On 29/11/2013 12:33, iMath wrote:
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> > BTW ,the Queue object has an attribute 'queue' ,but I cannot find it described in the DOC ,what it means ?
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> Really? AttributeError: type object 'Queue' has no attribute 'queue'
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> -- 
> 
> Python is the second best programming language in the world.
> 
> But the best has yet to be invented.  Christian Tismer
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> 
> Mark Lawrence

you can do a check by hasattr()