【python】【展平列表】

1 arr = [[1], [2, 3], [4, 5, 6]]
2 brr = sum(arr, [])
3 # [1, 2, 3, 4, 5, 6]
4 arr = [[1], [2, 3], [[4], [5], [6]]]
5 crr = sum(arr, [])
6 # [1, 2, 3, [4], [5], [6]]
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原文地址：https://www.cnblogs.com/ddzhen/p/15071910.html