Concatenating Strings: “Multiplication” of two list of strings

问题

For list of strings, define the multiplication operation in as concatenating here:

l1 = ['aa', 'bb', 'cc']
l2 = ['11', '22']
l3 = l1 op l2

Expected output:

l3 = ['aa11', 'aa22', 'bb11', 'bb22', 'cc11', 'cc22']

Simply we can use

for l in l1:
    for ll in l2:
        l3.append(l+ll)

But I'd be grateful to hear a pythonic solution.

回答1:

from itertools import product

l1 = ['aa', 'bb', 'cc']
l2 = ['11', '22']

l3 = [x+y for (x,y) in product(l1,l2)]

print(l3)

But it's effectively the same thing as what you're doing (provided you fix the typo :P)

回答2:

l3 = [a+b for a in l1 for b in l2]

来源：https://stackoverflow.com/questions/50689672/concatenating-strings-multiplication-of-two-list-of-strings