python顺时针(逆时针)打印列表

def clockwisePrint(matrix):
    res = []
    while matrix:
        res += matrix.pop(0)
        if matrix:
            index = 0
            for row in matrix:
                res.append(row.pop())  # only pop element 
                if not row: #delete empty row in case [[],[],[]] 
                    matrix.pop(index)
                index += 1
        if matrix:
            res += matrix.pop()[::-1]
        if matrix:
            index = len(matrix)
            for row in matrix[::-1]:
                index -= 1
                res.append(row.pop(0))
                if not row:
                    matrix.pop(index)
    return res

def antiClockwisePrint(matrix):
    res = []
    while matrix:
        index = 0
        for row in matrix:
            res.append(row.pop(0))
            if not row:
                    matrix.pop(index)
            index += 1
        if matrix:
            res += matrix.pop()
        if matrix:
            index = len(matrix)
            for row in matrix[::-1]:
                index -= 1
                res.append(row.pop())
                if not row:
                    matrix.pop(index)
        if matrix:
            res += matrix.pop(0)[::-1]
    return res