input: Write a python function to calculate the sum of the numbers in a list.
  assert calculate_sum([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 55
  assert calculate_sum([10, 20, 45, 67, 84, 93]) == 319
  assert calculate_sum([5, 7, 9, 8, 6, 4, 3]) == 42
output: def calculate_sum(numbers):
      return sum(numbers)