input: Write a function to calculate the distance between two points on a two-dimensional plane. The function should take four arguments corresponding to the x and y coordinates of two points (x1, y1, x2, y2). It should return the distance as a float value.
  
  assert calculate_distance(3, 4, -9, -2) == 13.0
  assert calculate_distance(0, 0, 4, 3) == 5.0
  assert calculate_distance(-1, -1, 2, 3) == 5.0
  assert calculate_distance(1, 1, 1, 1) == 0.0
  assert calculate_distance(-5, -3, -5, 3) == 6.0
output: def calculate_distance(x1, y1, x2, y2):
      return ((x2 - x1) ** 2 + (y2 - y1) ** 2) ** 0.5