lst = [j + k for j在s1中为s2] 
 

或

lst = [（j，k）for s in s1 for k in s2]

$ b $ p
$ b $ p $ j
$ p $ j code $ c $是外部循环，为k ... 是内部循环。

基本上，独立于'y'条款中的x，就像你想通过一个接一个地粘贴列表所理解的一样。

If I had two strings, 'abc' and 'def', I could get all combinations of them using two for loops:

for j in s1:
  for k in s2:
    print(j, k)

However, I would like to be able to do this using list comprehension. I've tried many ways, but have never managed to get it. Does anyone know how to do this?

lst = [j + k for j in s1 for k in s2]

or

lst = [(j, k) for j in s1 for k in s2]

if you want tuples.

Like in the question, for j... is the outer loop, for k... is the inner loop.

Essentially, you can have as many independent 'for x in y' clauses as you want in a list comprehension just by sticking one after the other.