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Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
哈，在不考虑性能的前提下，当然是越简略的代码越好
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我觉着题意有点难理解。难道是我英文不好？题干里加点例子就好了。
I do it in this way
return "%.2f" % length