code: def get_rectangle(self):
          
          rec = [self.pos[0], self.pos[1]]*2
          for age in self.nodes:
              for node in age:
                  # Check max/min for x/y coords
                  for i in range(2):
                      if rec[0+i] > node.pos[i]:
                          rec[0+i] = node.pos[i]
                      elif rec[2+i] < node.pos[i]:
                          rec[2+i] = node.pos[i]
          return tuple(rec)
docs: Gets the coordinates of the rectangle, in which the tree can be put.
  
          Returns:
              tupel: (x1, y1, x2, y2)