Now that you’ve learned to break strings apart using .split(), let’s learn to put them back together using .join(). .join() is essentially the opposite of .split(), it joins a list of strings together with a given delimiter. The syntax of .join() is:

'delimiter'.join(list_you_want_to_join)

Now this may seem a little weird, because with .split() the argument was the delimiter, but now the argument is the list. This is because join is still a string method, which means it has to act on a string. The string .join() acts on is the delimiter you want to join with, therefore the list you want to join has to be the argument.

This can be a bit confusing, so let’s take a look at an example.

my_munequita = ['My', 'Spanish', 'Harlem', 'Mona', 'Lisa']
print(' '.join(my_munequita))
# => 'My Spanish Harlem Mona Lisa'

We take the list of strings, my_munequita, and we joined it together with our delimiter, ' ', which is a space. The space is important if you are trying to build a sentence from words, otherwise, we would have ended up with:

print(''.join(my_munequita))
# => 'MySpanishHarlemMonaLisa'