input: 
  def area_circle(radius: float) -> float:
      """ Compute the area of a circle given its radius.
      >>> area_circle(5)
      78.54
      >>> area_circle(0)
      0.0
      >>> area_circle(1)
      3.14
      """
      import math
      return math.pi * (radius ** 2)
  
output:     import math
      return math.pi * (radius ** 2)