错误(无限循环或其他原因)导致我的代码中途停止在shell中运行

Question

虽然我不能确切地说出原因是什么，但我的代码中有一些东西导致它中途停止运行，使shell处于可以单击一行、键入、按enter等的状态，但shell本身没有给我任何反应。

完整代码如下：

from PIL import Image
import PIL.ImageOps

background = "background.png"
target = input("Please enter the name of your image (including file type)")
targetImage = Image.open(target)
background = Image.open(background)
area = targetImage.size 
backArea = background.size
area = (round(area[0] / 500), round(area[1] / 500))
backArea = (round(backArea[0] / 100), round(backArea[1] / 100))
targetImage = targetImage.resize(area)
background = background.resize(backArea)
size = area[0] * area[1]
targetWidth = area[0]
targetLength = area[1]
targetCoords = []

def analyser():
pixelOne = 1
pixelTwo = 1
completedSearch = 0

while completedSearch != size:
while pixelOne != targetWidth:
while pixelTwo != targetLength:
targetCoords.append((pixelOne, pixelTwo))
pixelTwo = pixelTwo + 1
completedSearch = completedSearch + 1
pixelTwo = 1
pixelOne = pixelOne + 1

colouredCoordsSum = []
largerColouredCoordsSum = []
smallerColouredCoordsSum = []
flatTargetCoords = [x for sets in targetCoords for x in sets]
coordLength = len(flatTargetCoords) - 1
for i in range(0, coordLength, 2):
firstnum = flatTargetCoords[i]
secondnum = flatTargetCoords[i+1]
sumnum = firstnum + secondnum
if firstNum > secondNum:
largerColouredCoordsSum.append("(",firstNum,", ",secondNum,"), (",sumnum,")")
else:
smallerColouredCoordsSum.append("(",firstNum,", ",secondNum,")")
colouredCoordsSum.append(sumnum)
global topLeft
global bottomRight
global topRight
global bottomLeft
topLeft = min(smallerColouredCoordsSum)
bottomRight = max(largerColouredCoordsSum)
topRight = topLeft + (area[0] - 1)
bottomLeft = bottomRight - (area[1] - 1)

analyser()
print(topLeft, topRight, bottomLeft, bottomRight)

我认为问题出在代码的第一个while循环的内容上：

while completedSearch != size:
while pixelOne != targetWidth:
while pixelTwo != targetLength:
targetCoords.append((pixelOne, pixelTwo))
pixelTwo = pixelTwo + 1
completedSearch = completedSearch + 1
pixelTwo = 1
pixelOne = pixelOne + 1

也就是说，可能还有其他错误导致了这种情况。由于代码在这种状态下没有在shell中完全运行，我无法在这一点之后删除错误。感谢您的帮助。

编辑：当我运行代码时，我会得到输入提示，但在键入文件名并按enter键后，我看不到任何运行内容，也看不到下一行的">>"，但我可以在空行之间单击，键入并在这些行上按enter键，但在这种状态下，shell对我键入的任何内容都没有反应。完成后，它应该将每个角的坐标打印到外壳上，但不会出现这种情况。

Answer 1

while completedSearch != size:
while pixelOne != targetWidth:
while pixelTwo != targetLength:
targetCoords.append((pixelOne, pixelTwo))
pixelTwo = pixelTwo + 1
completedSearch = completedSearch + 1
pixelTwo = 1
pixelOne = pixelOne + 1

当这个循环开始时，如果completedSearch大于size，或者pixelOne大于targetWidth，或者pixelTwo大于targetLength，它将永远不会退出。