Python 如何使用语法：从函数返回break和continue语句？

有了这个问题，我对整个语法提出了质疑，也许这是不可能的，但我们来看看：

我正在运行一个pygame窗口。现在我在这个pygame while循环中有很多代码。因此，我想创建一些函数

但是，我想要创建为函数的代码包含continue和break语句。如果我想从静态函数返回break或continue，很明显它会说U愚蠢？继续/中断在循环之外

我这里的主要问题是：您将如何以更好的方式设计/解决此问题

这就是我的代码大致的样子：

        pygame.init()

        while True:
            for event in pygame.event.get():
                if event.type == KEYDOWN:
                    pyEvents(event)

             ... # ridiculously long code

             # A small example code snippet that I need as a function
             (grabbed, frame0) = camera.read()
             if not grabbed: # End of feed
                break

             frame1 = cv2.cvtColor(frame0, cv2.COLOR_BGR2GRAY)
             frame2 = cv2.GaussianBlur(frame1, gaussianBlurKSize, 0)

             if master is None:
                master = frame2
                continue

这就是我想要实现的目标：

        pygame.init()

        while True:
            for event in pygame.event.get():
                if event.type == KEYDOWN:
                    pyEvents(event)

             ... # ridiculously long code

             # My dream function
             result = myFunction(camera, master)

             if result == break:
                 break
             elif result == continue:
                 continue

        def myFunction(camera, master):
             (grabbed, frame0) = camera.read()
             if not grabbed:
                return break # Error: outside a loop

             frame1 = cv2.cvtColor(frame0, cv2.COLOR_BGR2GRAY)
             frame2 = cv2.GaussianBlur(frame1, gaussianBlurKSize, 0)

             if master is None:
                master = frame2
                return continue, master # Error: outside a loop

             return frame2

---

您可以在函数中引发异常。在循环中，可以使用try-except构造。也许这个链接有帮助：

---

您可以在函数中引发异常。在循环中，可以使用try-except构造。也许这个链接有帮助：

只需创建一个全局布尔变量：

running = True
while running:
    # your code goes here

如果要中断循环，请将running设置为False：

只需创建一个全局布尔变量：

running = True
while running:
    # your code goes here

如果要中断循环，请将running设置为False：

---

像这样的怎么样

pygame.init()

while True:
    for event in pygame.event.get():
        if event.type == KEYDOWN:
            pyEvents(event)

        ... # ridiculously long code

        # My dream function
        frame2, master, result = myFunction(camera, master)

        if result == 'break':
            break
        elif result == 'continue':
            continue

def myFunction(camera, master):
    (grabbed, frame0) = camera.read()

    result = None

    if not grabbed:
        return None, None, 'break'

    frame1 = cv2.cvtColor(frame0, cv2.COLOR_BGR2GRAY)
    frame2 = cv2.GaussianBlur(frame1, gaussianBlurKSize, 0)

    if master is None:
        master = frame2
        return frame2, master, 'continue'

    return frame2, master, result

---

像这样的怎么样

pygame.init()

while True:
    for event in pygame.event.get():
        if event.type == KEYDOWN:
            pyEvents(event)

        ... # ridiculously long code

        # My dream function
        frame2, master, result = myFunction(camera, master)

        if result == 'break':
            break
        elif result == 'continue':
            continue

def myFunction(camera, master):
    (grabbed, frame0) = camera.read()

    result = None

    if not grabbed:
        return None, None, 'break'

    frame1 = cv2.cvtColor(frame0, cv2.COLOR_BGR2GRAY)
    frame2 = cv2.GaussianBlur(frame1, gaussianBlurKSize, 0)

    if master is None:
        master = frame2
        return frame2, master, 'continue'

    return frame2, master, result

---

您可以返回整数，如1-break、2-continue等。您可以返回字符串，如break，然后检查响应。您是对的。看起来很简单。你可以返回整数，比如1-break，2-continue等。你可以返回字符串，比如break，然后检查响应。你是对的。看起来很容易