error

Traceback (most recent call last):
  File "/home/zach/dev/python/scripting/lab2/part1.py", line 161, in <module>
    app.run()
  File "/home/zach/dev/python/scripting/lab2/basic_game/app.py", line 41, in run
    self.game.update(self.clock.get_time())
  File "/home/zach/dev/python/scripting/lab2/part1.py", line 36, in update
    [m.update(dt) for m in self.marios.values()]
  File "/home/zach/dev/python/scripting/lab2/part1.py", line 36, in <listcomp>
    [m.update(dt) for m in self.marios.values()]
TypeError: Argument must be a dict with rectstyle keys.

mario.py

import pygame

class Mario(object):

    def __init__(self):
        self.on_collision = lambda x: None
        
        self.rect = pygame.Rect
        self.enemies = dict()  # format: { string: pygame.Rect }
    
    def check_collisions(self):
        cs = self.rect.collidedict(self.enemies)
        if cs:
            {self.on_collision(c) for c in cs}