input: Write a python function to create a Vector3D object and verify its attributes.
  assert create_vector(1, 2, 3).x == 1
  assert create_vector(1, 2, 3).y == 2
  assert create_vector(1, 2, 3).z == 3
  assert create_vector(-1, 0, 5).x == -1
  assert create_vector(-1, 0, 5).y == 0
  assert create_vector(-1, 0, 5).z == 5
output: class Vector3D:
      def __init__(self, x, y, z):
          self.x = x
          self.y = y
          self.z = z
  
  def create_vector(x, y, z):
      return Vector3D(x, y, z)