Use a combination of split and sequence unpacking.
user_input = user_input(" Please enter the numbers: ")
a, b, c = user_input.split()
split
will take your string of numbers, say "x y z", and turn it into a list of elements in the string where the elements are all the words in the string that are separated by spaces. Thus split
will yield the string ['x', 'y', 'z'] for input 'x y z'.
Since a list is a form of sequence, its elements can be "unpacked" and assigned to a list of variables of your choosing.