Can anyone explain?

Question

I came across this code when I was looking for help in the Q&A section. I looked up what enumerate does so I have some understanding of it, but I don’t get lines 7-8. Can anyone explain how this code works?

a = [3,2,1]
b = [[1,2,3], [4,5,6]]
c = []

for i in b:
d = []
for index, A in enumerate(i):
d.append(A+a[index])
c.append(d)

print(c)

I modified the code a little to help me understand it.
This is the original code from the post:
https://www.sololearn.com/discuss/1311492/?ref=app

Answer 1

Python do not add list and number. Instead of A+a[index], try A + [a[index]].