你将如何转换这样的列表：
["foo",["banana","apple"], "banana", ["peaches","grapes"]]
进入
["foo","banana","apple", "banana", "peaches",'grapes"]
我试过了：
flat_list = [item for sublist in regular_list for item in sublist]
使用嵌套推导的一种方法list是检查每个元素是否为 a list，否则将其转换为列表类型：
regular_list = ["foo",["banana","apple"], "banana", ["peaches","grapes"]]
flat_list = [item for sublist in regular_list
for item in (sublist if isinstance(sublist, list) else [sublist])]
print(flat_list)
结果：
['foo', 'banana', 'apple', 'banana', 'peaches', 'grapes']
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