jeet shah added the comment:
after = [[1,2],[3,4]]
rows, cols = (len(after), len(after[0]))
before = [[0]*cols]*rows
# before = [[0 for i in range(cols)] for j in range(rows)] #uncomment this
array definition and comment above one... see difference in output.
print(before)
def calculation(a,b):
s = after[0][0]
for x in range(a+1):
for y in range(b+1):
s += before[x][y]
before[a][b] = after[a][b] - s
def cal2():
for x in range(len(after)):
for y in range(len(after[0])):
calculation(x,y)
before[0][0] = after[0][0]
print(before)
cal2()
#expected output: [[1, 1], [2, 0]]
--
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<https://bugs.python.org/issue41827>
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