如何在Python中嵌套列表推导

Question

我正在尝试使用列表理解从2个列表中创建一个新列表

>>> l = ['%sdummy1', '%sdummy2']
>>> z = ['new1', 'new2']

有了基本的列表理解知识，我可以获得以下列表

>>> x = [item % 'new1' for item in l]
['new1dummy1', 'new1dummy2']
>>>

但是我如何遍历“ z”并获得下面的列表？

['new1dummy1', 'new1dummy2', 'new2dummy1', 'new2dummy2']

Answer 1

只需使用双重平面列表理解即可：

l = ['%sdummy1', '%sdummy2']
z = ['new1', 'new2']

result = [x % y for x in l for y in z]

结果：

['new1dummy1', 'new2dummy1', 'new1dummy2', 'new2dummy2']