a function that does 2D collision detection between rectangles.

def rect_collide(rect1, rect2):
  return rect1['x'] < rect2['x'] + rect2['width'] and \
         rect1['x'] + rect1['width'] > rect2['x'] and \
         rect1['y'] < rect2['y'] + rect2['height'] and \
         rect1['y'] + rect1['height'] > rect2['y']

rect_collide(rect1, rect2)