input: Write a function to calculate the total sum of all elements in the given list using a for loop. The function should return the sum.
  
  def calculate_sum(data):
      total = 0
      for element in data:
          total = total + element
      return total
  
  assert calculate_sum([1, 9, 3, 5]) == 18
  assert calculate_sum([10, 20, 30]) == 60
  assert calculate_sum([0, 0]) == 0
  assert calculate_sum([]) == 0
output: def calculate_sum(data):
      total = 0
      for element in data:
          total = total + element
      return total