Splitting string into words and space and punctuation

inp = "Hello world!"

and I expect something like that ["Hello"," ","world","!"]

>Solution :

using itertools.groupby

You can use itertools.groupby and a check with str.isalpha (which you can easily adapt to other character classes if needed):

s = "Hello world!"

from itertools import groupby
out = [''.join(g) for _,g in groupby(s, str.isalpha)]

output: ['Hello', ' ', 'world', '!']

using a regex

You can also use a regex and split on the word boundaries (dropping the first item that is the sentence start):

s = "Hello world!"

import re
out = re.split(r'\b', s)[1:]

output: ['Hello', ' ', 'world', '!']

NB. don’t use input as variable name, this is a python builtin