How to create lists from a cartesian product of two string lists

I have two string lists that look like this:

print(objects_list)
print(verb_list)

they output:

['parking_meter', 'sink', 'teddy_bear']
 
 ['sail', 'fill', 'fly', 'greet', 'hit', 'hose', 'hunt', 'install',
 'kick', 'launch', 'move', 'pick', 'repair', 'sit_at', 'squeeze',
 'stab', 'straddle', 'talk_on']

I want product of these two lists in a format that looks like this:

[['parking_meter','sail'],['parking_meter','fill'],['parking_meter','fly']......]

I tried this code

list3 = [[str(l),str(n)] for l in objects_list for n in verb_list]
print(list3)

but it outputs:

[['[', '['], ['[', "'"], ['[', 's'], ['[', 'a'], ['[', 'i'], ['[',
 'l'], ['[', "'"], ['[', ','], ['[', ' '], ['[', "'"], ['[', 'f'],
 ['[', 'i'], ['[', 'l'], ['[', 'l'], ['[', "'"], ['[', ','], ['[', '
 '], ['[', "'"], ['[', 'f'], ['[', 'l'], ['[', 'y'], [.....

any solution?

>Solution :

From the output you get, it seems your input lists are strings, not lists.

As if objects_list was the output of print(objects_list), not the list itself.

Therefore, when iterating over objects_list, rather than interating over list items, you are iterating over the characters of its string reprensentation:

"["
"'"
"p"
"a"
...

Your code is otherwise correct, except you don’t need to cast the elements to string in the list comprehension.

list3 = [[l, n] for l in objects_list for n in verb_list]