input: from typing import List
  
  
  def calculate_square_root(n: float) -> float:
      """
      Calculate the square root of a given positive number.
  
      >>> calculate_square_root(100)
      10.0
      >>> calculate_square_root(25)
      5.0
      """
  
output:     if n < 0:
          raise ValueError("Input must be a positive number")
      return n ** 0.5