Python, how to print dictionary key and its values in each line?

Question

Please see the below image for reference:

Answer 1

Probably something like this:

d = {1:[2,3], 2:[4,5]}

for key in d:
    for i in d[key]:
        print("{0}:{1}".format(key, i))


1:2
1:3
2:4
2:5