def replace_sublist(lst, start, end, new_list):
return lst[:start] + new_list + lst[end:]
lst = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
new_list = [10, 11, 12]
lst = replace_sublist(lst, 3, 6, new_list)
print(lst)
'''
run:
[0, 1, 2, 10, 11, 12, 6, 7, 8, 9]
'''