Python:未绑定(bind)方法

Question

当我尝试绑定(bind)方法时，出现错误:

Traceback (most recent call last):
  File "pygametest3.py", line 12, in <module>
    render = winback.rend()
TypeError: unbound method rend() must be called with winback instance as first argument (got nothing instead)

这是代码，直到违规点:

import sys, pygame

pygame.init()

class winback:
    """Render the window"""
    def rend(self):
        rendsurf.fill(black)
        rendsurf.blit (landsurf, (landx,landy,640,480))
        screen.blit (rendsurf, (0,0,640,480))
        pygame.display.flip()
render = winback.rend()

此外，如果这是显而易见的并且不值得发布/重新发布，我很抱歉。这是我第一次真正投入到 python 中，我为此工作了一整天，感觉有点傻，现在是凌晨 12 点 30 分。

Answer 1

类必须先实例化，然后才能调用它们的普通方法。

class Winback(object):
  def rend(self):
    ...

winback = Winback()
render = winback.rend()

或者你可以使用@staticmethod。 But make it a module-level function instead .