我知道这是我自己的问题，但我需要一个有效的答案，所以我将其添加到字符类中:

I know this is my own question but I needed an answer that worked well so I added this to the character class:

if self.x < 0:
    self.x = 3
if self.x > 800:
    self.x = 790
if self.y < 0:
    self.y = 3
if self.y > 800:
    self.y = 790