input: Write a function to identify and correct any bugs in the provided Python code for summing elements in a list. The function should return the corrected code.
  
  ### Input:
  def sum_list(list):
      sum_list = 0
      for num in list:
          sum_list += num
      return sum
  
  ### Output:
  def sum_list(list):
      sum_list = 0
      for num in list:
          sum_list += num
      return sum_list
  
  assert sum_list([1, 2, 3, 4, 5])==15
  assert sum_list([])==0
  assert sum_list([10, -5, 15])==20
  assert sum_list([-1, -2, -3, -4, -5])==-15
  assert sum_list([0, 0, 0, 0])==0
output: def sum_list(list):
      sum_list = 0
      for num in list:
          sum_list += num
      return sum_list