Best way is to use list comprehension:
def map_to_list(my_list, n):
# multiply every value in my_list by n
# Use list comprehension!
my_new_list = [i * n for i in my_list]
return my_new_list
# To test:
print(map_to_list([1,2,3], -1))
Returns: [-1, -2, -3]