input: from typing import List
  
  def sum_array(array: List[float]) -> float:
      """A function that takes in an array of numbers and returns the sum of all the numbers using Python built-in functions.
      >>> sum_array([1.0, 2.0, 3.0])
      6.0
      >>> sum_array([-1.0, 0.0, 1.0])
      0.0
      """
      return sum(array)
output:     return sum(array)