input: Write a function to calculate the distance between two points on a two-dimensional plane. The function should take four parameters: x1, y1 (the coordinates of the first point) and x2, y2 (the coordinates of the second point). The function should return the distance between these two points as a float value.
  assert calculate_distance(3, 4, -9, -2) == 13.0
  assert calculate_distance(0, 0, 0, 0) == 0.0
  assert calculate_distance(1, 5, 4, 1) == 5.0
  assert calculate_distance(-3, 4, -3, 4) == 0.0
  assert calculate_distance(1, 1, 4, 5) == 5.0
output: def calculate_distance(x1, y1, x2, y2):
      return ((x2 - x1) ** 2 + (y2 - y1) ** 2) ** 0.5