[Python] flip an image vertically using loops in python

n my function there are the two options: flipping vertically or horizontally. vertically if vertically = True. The horizontal part is correct however, when i try to flip an image vertically, the image i get ends up being just 42% flipped. I don´t know which part of my code is wrong. Can you give me some guidance?

def flip(image,vertical=False):

height = len(image)
width = len(image[0])

for row in range(height):
for col in range(width//2):
pixel = image[row][col]
image[row][col] = image[row][width - col - 1]
image[row][width - col - 1] = pixel
if vertical == True:
image[row][col] = image[height-row-1][width - col - 1]
image[height-row-1][width - col - 1] = pixel

return True

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