New submission from Yaowei Zhang: #If we define a list by: nums = [[0]*3]*3 #nums = [[0,0,0],[0,0,0],[0,0,0]] nums[0][1] = 1 print(mums) # the result is [[0,1,0],[0,1,0],[0,1,0]] #I think it is because all the line use the same list variable, but it suppose #not.
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