triangles()

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#12 Created at ... [Delete] [Delete and Lock User]

牛逼

#13 Created at ... [Delete] [Delete and Lock User]

我测试成功了，但有一个问题：第二次调用该函数时，len（L）长度为1，1-1=0，i==0,L[i] +L[i+1]变成L[0]+L[1]，L[1]不存在为什么不报异常呢？

#14 Created at ... [Delete] [Delete and Lock User]

现才知道 list 可以做加法

#15 Created at ... [Delete] [Delete and Lock User]

牛皮

#16 Created at ... [Delete] [Delete and Lock User]

优秀

#17 Created at ... [Delete] [Delete and Lock User]

太强了大佬

#18 Created at ... [Delete] [Delete and Lock User]

没想到列表还可以做加法，简单了很多

#19 Created at ... [Delete] [Delete and Lock User]

range(0)是none

#20 Created at ... [Delete] [Delete and Lock User]

受教了，想半天写出一大片还是错的。