Pythons thorpy 库 AttributeError 在应用程序中使用 thorpy.DropDownListLauncher

如何解决Pythons thorpy 库 AttributeError 在应用程序中使用 thorpy.DropDownListLauncher

我正在开发一些应用程序，但出现了一个 Thorpy 元素的问题。这里的简单示例：

import pygame
import thorpy
pygame.init()
pygame.key.set_repeat(300,30)
screen = pygame.display.set_mode((400,400))
screen.fill((255,255,255))
rect = pygame.Rect((0,50,50))
rect.center = screen.get_rect().center
clock = pygame.time.Clock()
values = ["option a","option b","option c"]
dropdownlist = thorpy.DropDownListLauncher.make(const_text="Choose something",var_text=values[0],titles=values)
Box = thorpy.Box(elements=[dropdownlist])
menu = thorpy.Menu(Box)

for element in menu.get_population():
    element.surface = screen
Box.set_topleft((100,100))
Box.blit()
Box.update()
playing_game = True
while playing_game:
    clock.tick(45)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            playing_game = False
            break
        menu.react(event) 
pygame.quit()

当尝试使用下拉列表时出现 AttributeError：

Traceback (most recent call last):   
File "D:/app/test.py",line 45,in <module>
 menu.react(event) #the menu automatically integrate your elements   
File "D:\app\venv\lib\site-packages\thorpy\menus\basicmenu.py",line 121,in react 
 element.react(event)   
File "D:\app\venv\lib\site-packages\thorpy\elements\ghost.py",line 328,in react 
 reaction._try_activation(event)   
File "D:\app\venv\lib\site-packages\thorpy\miscgui\reaction.py",line 57,in _try_activation 
self.reac_func(**self.params)   
File "D:\app\venv\lib\site-packages\thorpy\miscgui\launchers\launcher.py",line 253,in launch     
 self.prelaunch()   
File "D:\app\venv\lib\site-packages\thorpy\miscgui\launchers\launcher.py",line 215,in prelaunch         
 self.activate_focus()   
File "D:\app\venv\lib\site-packages\thorpy\miscgui\launchers\launcher.py",line 178,in 
 activate_focus self.save_active_records()   
File "D:\app\venv\lib\site-packages\thorpy\miscgui\launchers\launcher.py",line 170,in save_active_records
 for e in menu.get_population(): 
AttributeError: 'nonetype' object has no attribute 'get_population'

如果菜单中没有这个元素它工作正常，我的问题是如何摆脱这个错误或以另一种方式？