我知道这里有一些非常基本的错误，但我只是看不到。如果在 Python 方面更有经验的人能够指出我在这里误解的地方，我将非常感激。我在下面发布了我的代码的简化版本。要追溯到问题的根源，请注意以下几点:
MainProgram 实例化为 Main = MainProgram()，有一个菜单 (self.menu = Startmenu())，它是Menu 类的实例。这个 Menu 类有一个按钮列表 (self.buttons = [...]) - 在本例中只有一个。它们是 Button 类的实例。我现在需要将单击按钮时要触发的函数传递给 Button 类的该实例，以便我可以实际使用它。
我真的很感谢任何有经验的用户快速浏览一下它。我确信我没有看到一些非常基本的东西。我敢打赌我太累了，看不到它......因为现在家里有婴儿，所以只睡了大约 2 个小时:D
我的代码:
class MainProgram:
#Much much more code
def __init__(self):
#And so much more code here
self.menu = StartMenu()
class StartMenu:
def __init__(self):
#Much code which is not important to us here
self.buttons = [Button("d_bt_start", (100, 60)
, testfunc, "TEST-TEXT")]
class Button:
def __init__(self, image, pos = (0, 0), path = Paths.path_img
, alpha = False, func = None, args = None):
self.img_normal = helper.loadImage(path, image + "_normal.jpg", alpha)
self.img_hover = helper.loadImage(path, image + "_hover.jpg", alpha)
self.image = self.img_normal
self.pos = pos
self.x = pos[0]
self.y = pos[1]
self.width = self.x + self.image.get_width()
self.height = self.y + self.image.get_height()
self.mouseover = 0
self.func = func
self.args = args
def update(self, (mx, my)):
if (mx >= self.x and mx <= self.width and
my >= self.y and my <= self.height):
if self.mouseover == 0:
self.image = self.img_hover
self.mouseover = 1
else:
if self.mouseover == 1:
self.image = self.img_normal
self.mouseover = 0
def clicked(self, button):
if (mx >= self.x and mx <= self.width and
my >= self.y and my <= self.height):
if button == 1:
self.func(self.args)
应该发生什么:主文件创建 StartMenu 类的实例。在 StartMenu 类中，我们将一个按钮定义为 Button 类的实例。单击该按钮后应触发函数 testfunc(args)。到目前为止，这个测试函数只是“TEST-TEXT”参数的打印。
如果我将函数传递为
testfunc
然后我收到以下错误回溯:
Traceback (most recent call last):
File "D:\Python27\_RPG DEMO\DEMO\main.py", line 41, in <module>
Main = MainProgram()
File "D:\Python27\_RPG DEMO\DEMO\main.py", line 21, in __init__
self.menu = menus.StartMenu()
File "D:\Python27\_RPG DEMO\DEMO\menus.py", line 11, in __init__
, zztestfile.testfunc, "TESTEST")
File "D:\Python27\_RPG DEMO\DEMO\buttons.py", line 7, in __init__
self.img_normal = helper.loadImage(path, image + "_normal.jpg", alpha)
File "D:\Python27\_RPG DEMO\DEMO\helper.py", line 13, in loadImage
return pygame.image.load(os.path.join(folder, name)).convert_alpha()
File "D:\Python27\lib\ntpath.py", line 96, in join
assert len(path) > 0
TypeError: object of type 'function' has no len()
如果我将其传递为:
testfunc("TEST-TEXT")
它会触发，但随后会导致以下回溯:
TEST-TEXT
Traceback (most recent call last):
File "D:\Python27\_RPG DEMO\DEMO\main.py", line 41, in <module>
Main = MainProgram()
File "D:\Python27\_RPG DEMO\DEMO\main.py", line 21, in __init__
self.menu = menus.StartMenu()
File "D:\Python27\_RPG DEMO\DEMO\menus.py", line 11, in __init__
, testfunc("TEST-TEXT"))
File "D:\Python27\_RPG DEMO\DEMO\buttons.py", line 7, in __init__
self.img_normal = helper.loadImage(path, image + "_normal.jpg", alpha)
File "D:\Python27\_RPG DEMO\DEMO\helper.py", line 15, in loadImage
return pygame.image.load(os.path.join(folder, name)).convert()
File "D:\Python27\lib\ntpath.py", line 96, in join
assert len(path) > 0
TypeError: object of type 'NoneType' has no len()
到目前为止，我已经阅读了一些教程，但我真的不知道我在哪里误解了它们。我真的很感激任何帮助!
最佳答案
您正在将测试函数传递给 Button 类的 path 参数:
self.buttons = [Button("d_bt_start", (100, 60)
, testfunc, "TEST-TEXT")]
这是第三个位置参数:
def __init__(self, image, pos = (0, 0), path = Paths.path_img
, alpha = False, func = None, args = None):
与路径匹配。使用关键字参数代替:
self.buttons = [Button("d_bt_start", (100, 60)
, func=testfunc, args="TEST-TEXT")]
关于python - 将函数作为参数传递，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23106727/