吃大大卷 | #顺时针打印矩阵#

# -*- coding:utf-8 -*-
class Solution:
    # matrix类型为二维列表，需要返回列表
    def printMatrix(self, matrix):
        # write code here
        self.mat = matrix
        self.print_info = []
        while self.mat:
            if self.mat[0]:
                self.printTop()
                self.printRight()
                self.printBottom()
                self.printLeft()
            else:
                del self.mat[0]
        return self.print_info

    def printTop(self):
        if len(self.mat) == 0:
            return
        elif len(self.mat[0]) == 0:
            return
        for ele in self.mat[0]:
            self.print_info.append(ele)
        del self.mat[0]
    
    def printRight(self):
        if len(self.mat) == 0:
            return
        elif len(self.mat[0]) == 0:
            return
        for ele in self.mat:
            self.print_info.append(ele[-1])
            del ele[-1]
    
    def printBottom(self):
        if len(self.mat) == 0:
            return
        elif len(self.mat[0]) == 0:
            return
        for ele in self.mat[-1][::-1]:
            self.print_info.append(ele)
        del self.mat[-1]
    
    def printLeft(self):
        if len(self.mat) == 0:
            return
        elif len(self.mat[0]) == 0:
            return
        for ele in self.mat[::-1]:
            self.print_info.append(ele[0])
            del ele[0]

吃大大卷，拉出一截（打印），吃掉一截（删除）