Python - unpack list of lists [duplicate]

Question

What is the cleanest way to implement the following:

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list = [list1, list2, ...]
return [*list1, *list2, ...]

It looks like this syntax will be available in Python 3.5. In the meantime, what is your solution?

Answer 1

This is commonly written as:

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[x for l in list for x in l]