Break indentation for nested loop

This question already has an answer here:

How to break out of multiple loops in Python? 30 answers

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考虑将代码放入一个函数中，并使用return语句打破所有循环。

def func():
    im1 = Image.open("C:UsersPoosDesktopGgreen_pixel.bmp")
    A = list(im1.getdata())

    x = 0
    y = 0

    im2 = ImageGrab.grab()
    B = list(im2.getdata())

    for x in range(0,1024, 50):
        for y in range(0,600, 20):
        if(B != A):
            im3 = im2.crop((x,y,x+1,y+1))
            B = list(im3.getdata())
            print(x, y)

        else:
            print("hooray!")
            return

        return

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