input: def sum_array(array):
      """A function that takes in an array of numbers and returns the sum of all the numbers
      >>> sum_array([1, 2, 3, 4, 5])
      15
      >>> sum_array([10, 20, 30])
      60
      >>> sum_array([])
      0
      """
      return sum(array)
output:     return sum(array)