Python递归展开嵌套的list

在Python中，用生成器的递归的方式展开一个嵌套的list。

def flatten(nested):
	try:
		for sublist in nested:
			if isinstance(sublist,str):
				yield sublist
			else:
				for element in flatten(sublist):
					yield element
	except TypeError:
		yield nested

运行后结果：

>>> list(flatten([[[1],2],[3,[4,'abc']]]))
[1, 2, 3, 4, 'abc']