How does this code will fail with same procedure as right code?

  • 0
        result = [[1],[1,1]]
        curr = [1,1]
        index = []
        if numRows == 0:
            return []
        if numRows == 1:
            return [[1]]
        if numRows == 2:
            return result
        for i in range(numRows-2):
            index = [1]
            while len(curr)>1:
                x = curr.pop(0)
            curr = index
        return result

    It very tricky that I found this code will change the result list while running curr change, as marked. I only pop the element from the curr list, but result list will also be changed. I don't get the reason, can somebody explain ? You can test this code, and will get very funny answer.

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