input: Write a function to suggest an improvement for the given Python code for finding the sum of elements of a list. The original code is as follows:
  
  def sum_elements(arr):
      sum_value = 0
      for num in arr:
          sum_value += num
      return sum_value
  
  The improved code should be implemented correctly and elegantly. If the given list is empty, it should return 0.
  
  assert sum_elements([1, 2, 3, 4, 5])==15
  assert sum_elements([0, 0, 0])==0
  assert sum_elements([])==0
  assert sum_elements([-1, 1, -2, 2])==0
  assert sum_elements([-5, -3, -2])==-10
output: def sum_elements(arr):
      return sum(arr)