python/string: how to get all the possible combinations in string considering only space for splitting the string

I have a string
dt = '301 302 303'
how can I get different combinations of above string with considering only spaces while splitting the string.

# output
301
302
303
301 302
301 303
302 303
301 302 303

>Solution :

Please use itertools module
turn the string to a list
and then iterate

dt = '301 302 303' 
import itertools
list1 = dt.split()
for i in range(1,len(list1) + 1):
    for subset in itertools.combinations(list1,i):
        print(subset)