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

Question

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?

Answer 1

Try this, use the itertools library. There is a function called product that gets you a cartesian product.

import itertools

x = ['parking_meter', 'sink', 'teddy_bear']

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

Then you can do this 2-liner, (because the product function returns a tuple but you require a list)

z = list(itertools.product(x,y))
z = [list(z) for z in z]

Or this 1-liner,

z = [list(tup) for tup in list(itertools.product(x, y))]

Then I,

print (z)

Which gives me

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