input: Write a python function to calculate the square root of a number.
  assert calculate_square_root(16) == 4.0
  assert calculate_square_root(25) == 5.0
  assert calculate_square_root(9) == 3.0
  assert calculate_square_root(0) == 0.0
output: def calculate_square_root(n):
      return n ** 0.5