这里在运行时会报错，说没有输入self，我应该如何修改呢？

#文件blank.py
import sys
import pygame
from setting import settings
import heroes
import game_functions as g_f
def run_game():
    pygame.init()
    setting=settings()
    screen=pygame.display.set_mode((setting.width,setting.high))
    chenping=heroes.teacher_chen(screen)
    pygame.display.set_caption("CP VS ZWW")
    while True:
        g_f.check_event(chenping)
        heroes.teacher_chen.update_place()  #这里报错，说没有传递self
        g_f.update_screen(setting,screen,chenping)
run_game()

#文件heroes.py
import pygame

class teacher_chen():
    def __init__(self,screen):
        self.screen=screen
        self.image=pygame.image.load('photos/chenping.bmp')
        self.screen_rect=screen.get_rect()
        self.moving="pause"
        self.rect=[self.screen_rect.centerx,self.screen_rect.centery]
    def update_place(self):
        if self.moving=='right':
            teacher_chen.rect[0]+=1
        if self.moving=='left':
            teacher_chen.rect[0]-=1
        if self.moving=='up':
            teacher_chen.rect[1]-=1
        if self.moving=='down':
            teacher_chen.rect[1]+=1
    def blit(self):
        self.screen.blit(self.image,self.rect)

1.模块heroes中teacher_chen类中不要用teacher_chen.rect[0]+=1，用self.rect[0]+=1
2.模块blank中 heroes.teacher_chen.update_place()用chenping.update_place(),你前面的类没有实例化