input: 
  from typing import Tuple
  from math import sqrt
  
  def distance_between_points(point1: Tuple[int, int], point2: Tuple[int, int]) -> float:
      """
      Calculate the distance between two points on a two-dimensional plane.
      >>> distance_between_points((3, 4), (-9, -2))
      13.416407864998739
      >>> distance_between_points((0, 0), (1, 1))
      1.4142135623730951
      """
      x1, y1 = point1
      x2, y2 = point2
      return sqrt((x2 - x1)**2 + (y2 - y1)**2)
  
output:     x1, y1 = point1
      x2, y2 = point2
      return sqrt((x2 - x1)**2 + (y2 - y1)**2)