new_contents: import document
  from time import time
  print("hello")
  class Canvas:
      def __init__(self, canvas_id, fps=120):
          self.canvas = document.getElementById(canvas_id)
          self.ctx = self.canvas.getContext("2d")
          self.fps = fps
          self.looping = False
          self.elements = []
          self.binds = []
          self.loops = []
      def _redraw(self):
          self.canvas.clearRect(0, 0, self.canvas.width, self.canvas.height)
          for drawable in self.elements:
              drawable._draw()
      def _get_binds(self):
          for bind in self.binds:
              bind.retrieve()
      def _run_loops(self):
          for x, loop in self.loops:
              loop.run()
              if not loop.persistent:
                  del loop
      def add_element(self, element):
          self.elements.append(element)
          return len(self.elements) - 1
      def remove_element(self, index):
          del self.elements[index]
      def clear_elements(self):
          self.elements = []
      def add_loop(self, loop):
          self.loops.append(loop)
          return len(self.loop) - 1
      def remove_loop(self, index):
          del self.loops[index]
      def clear_loops(self):
          self.loops = []
      def end(self):
          self.looping = False
      def mainloop(self):
          self.looping = True
          expected_time = time() + 1/self.fps
          while self.looping:
              while time() < expected_time:
                  pass
              expected_time = time() + 1/ self.fps
              self._get_binds()
              self._run_loops()
              self._redraw()
  
  class Drawable:
      def __init__(self, canvas):
          self.canvas = canvas
          self.index = self.canvas.add_element(self)
      def _draw(self):
          pass
      def __del__(self):
          self.canvas.remove_element(self.index)
  
  class Rectangle(Drawable):
      def __init__(self, canvas, x1, y1, width, height, color="black"):
          Drawable.__init__(self, canvas)
          self.x1 = x1
          self.y1 = y1
          self.width = width
          self.height = height
          self.color = color
      def _draw(self):
          self.canvas.ctx.fillStyle = self.color
          self.canvas.ctx.fillRect(self.x1, self.y1, self.width, self.height)
      def shift(self, amountx, amounty):
          self.x1 += amountx
          self.y1 += amounty
      def is_within(self, x, y):
          if self.x1 < x < self.x2 and self.y1 < y < self.y2:
              return True
          return False
  
  class Square(Rectangle):
      def __init__(self, cornerX, cornerY, width=1, **kwargs):
          Rectangle.__init__(self, cornerX, cornerY, width, width, **kwargs)
      def resize(self, new_width):
          self.width = new_width
          self.height = new_width
      def _draw(self):
          self.height = self.width
          Rectangle._draw(self)
  
subject: Create main.py