How to use .split while keeping delimiter characters in output?

Question

Python

There is a challenge in the book "Your Own Programmer" (Corey Althoff).
Primitive, but with it there was a problem.

Call the method that turns the string 'Where is this? Who is it? When is that?' to the list ['Where is this?', 'Who is this?', 'When is this?']

This is clearly about .split
But if a = 'Where is this? Who is it? When is that?' , then:

print(a.split(' '))
#output['Where', 'is this?', 'Who', 'is this?', 'When', 'is this?']

print(a.split(' ?'))
#output['Where is this', ' Who is this', ' When is this', '']

print(a.split('? '))
#output['Where is this', 'Who is this', ' When is it?'

] "Where is this" != "Where is this?" and "Who is this" != "Who is this?" , the condition of the task is not met.

What am I doing wrong?
How is it done correctly?

Answer 1

import re
res = list(filter(None, re.split('([^?]+\?)','Где это? Кто это? Когда это?')))
print(res)