正文
python算法：嵌套数组转变成一维数组
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比如，输入是：[2, 1, [3, [4, 5], 6], 7, [8]]
则，输出是：[2, 1, 3, 4, 5, 6, 7, 8]
def list_flatten(l, a=None):
a = list(a) if isinstance(a, (list, tuple)) else []
for i in l:
if isinstance(i, (list, tuple)):
a = list_flatten(i, a)
else:
a.append(i)
return a
