input: Write a function to suggest an improvement for the following Python code for finding the sum of elements of a list.
  def sum_elements(arr):
      sum_value = 0
      for num in arr:
          sum_value += num
      return sum_value
  assert sum_elements([1, 2, 3, 4])==10
  assert sum_elements([10, 20, 30])==60
  assert sum_elements([])==0
  assert sum_elements([-1, -2, -3])==-6
  assert sum_elements([5])==5
output: def sum_elements(arr):
      return sum(arr)