I have two lists that I’m trying to combine:

lst1 = [['arg1', 'arg2']]  # this can have more lists, but for simplicity, leaving it as this
lst2 = ['arg3', 'arg4']

I want the product of the two lists so that the product is:

[['arg1', 'arg2', 'arg3'], ['arg1', 'arg2', 'arg4']]

I can obviously loop through and do this, but I need to be able to do this as a one-liner (I have reasons).

I’ve been able to do this by doing the following:

list(
    map(
        lambda l: list(itertools.chain.from_iterable(l)),
        list(itertools.product(lst, lst2)),
    )
)

…which is okay, but I’m wondering if there’s a bette way to do this. I also feel like there should be a more mathematical way to express what I’m describing? Maybe itertools isn’t the right library?