Write a Python program to generate all sublists of a list.

from itertools import combinations
def sub_lists(my_list):
	subs = []
	for i in range(0, len(my_list)+1):
	  temp = [list(x) for x in combinations(my_list, i)]
	  if len(temp)>0:
	    subs.extend(temp)
	return subs


l1 = [10, 20, 30, 40]
l2 = ['X', 'Y', 'Z']
print("Original list:")
print(l1)
print("S")
print(sub_lists(l1))
print("Sublists of the said list:")
print(sub_lists(l1))
print("\nOriginal list:")
print(l2)
print("Sublists of the said list:")
print(sub_lists(l2))