input: Write a python function to calculate the standard deviation of a list.
  assert calculate_standard_deviation([1, 2, 3, 4, 5, 6]) == 1.707825127659933
  assert calculate_standard_deviation([1, 2, 3]) == 0.816496580927726
  assert calculate_standard_deviation([2, 4, 4, 4, 5, 5, 7, 9]) == 2.0
output: def calculate_standard_deviation(numbers):
      import math
      mean = sum(numbers) / len(numbers)
      variance = sum((x - mean) ** 2 for x in numbers) / len(numbers)
      return math.sqrt(variance)