input: Write a function to suggest an improvement for the following Python code that finds the sum of elements of a list. The improved function should be more concise and efficient.
  def sum_elements(arr):
      sum_value = 0
      for num in arr:
          sum_value += num
      return sum_value
  assert sum_elements([1, 2, 3, 4, 5])==15
  assert sum_elements([0, 0, 0])==0
  assert sum_elements([-1, 0, 1])==0
  assert sum_elements([])==0
  assert sum_elements([10])==10
  assert sum_elements([-1, -2, -3, -4, -5])==-15
output: def sum_elements(arr):
      return sum(arr)